diff --git a/admin-portal/src/app/models/book.ts b/admin-portal/src/app/models/book.ts
index cccc4f8..dd8b24c 100644
--- a/admin-portal/src/app/models/book.ts
+++ b/admin-portal/src/app/models/book.ts
@@ -8,7 +8,7 @@ export class Book {
   public category: string;
   public numberOfPages: number;
   public format: string;
-  public isbn: number;
+  public isbn: string;
   public shippingWeight: number;
   public listPrice: number;
   public ourPrice: number;
diff --git a/bookstore-api/.idea/workspace.xml b/bookstore-api/.idea/workspace.xml
index 399e810..86b95d6 100644
--- a/bookstore-api/.idea/workspace.xml
+++ b/bookstore-api/.idea/workspace.xml
@@ -16,16 +16,26 @@
   <component name="ExecutionTargetManager" SELECTED_TARGET="default_target" />
   <component name="FileEditorManager">
     <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
-      <file leaf-file-name="UserResource.java" pinned="false" current-in-tab="true">
+      <file leaf-file-name="UserResource.java" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/src/main/java/com/bookstore/resource/UserResource.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="170">
+            <state relative-caret-position="575">
               <caret line="207" column="85" lean-forward="true" selection-start-line="207" selection-start-column="85" selection-end-line="207" selection-end-column="85" />
               <folding />
             </state>
           </provider>
         </entry>
       </file>
+      <file leaf-file-name="Book.java" pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/src/main/java/com/bookstore/domain/Book.java">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="270">
+              <caret line="23" column="29" lean-forward="true" selection-start-line="23" selection-start-column="29" selection-end-line="23" selection-end-column="29" />
+              <folding />
+            </state>
+          </provider>
+        </entry>
+      </file>
       <file leaf-file-name="PaymentResource.java" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/src/main/java/com/bookstore/resource/PaymentResource.java">
           <provider selected="true" editor-type-id="text-editor">
@@ -140,7 +150,6 @@
       <list>
         <option value="$PROJECT_DIR$/src/main/java/com/bookstore/service/impl/UserSecurityService.java" />
         <option value="$PROJECT_DIR$/src/main/java/com/bookstore/config/SecurityUtility.java" />
-        <option value="$PROJECT_DIR$/src/main/java/com/bookstore/domain/Book.java" />
         <option value="$PROJECT_DIR$/src/main/java/com/bookstore/domain/BillingAddress.java" />
         <option value="$PROJECT_DIR$/src/main/java/com/bookstore/domain/BookToCartItem.java" />
         <option value="$PROJECT_DIR$/src/main/java/com/bookstore/domain/CartItem.java" />
@@ -175,6 +184,7 @@
         <option value="$PROJECT_DIR$/src/main/java/com/bookstore/resource/ShippingResource.java" />
         <option value="$PROJECT_DIR$/src/main/java/com/bookstore/domain/UserShipping.java" />
         <option value="$PROJECT_DIR$/src/main/java/com/bookstore/resource/UserResource.java" />
+        <option value="$PROJECT_DIR$/src/main/java/com/bookstore/domain/Book.java" />
       </list>
     </option>
   </component>
@@ -972,12 +982,12 @@
       <workItem from="1486538831944" duration="450000" />
       <workItem from="1488378219247" duration="650000" />
       <workItem from="1488461561430" duration="18419000" />
-      <workItem from="1488731165185" duration="27087000" />
+      <workItem from="1488731165185" duration="27199000" />
     </task>
     <servers />
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="89099000" />
+    <option name="totallyTimeSpent" value="89211000" />
   </component>
   <component name="ToolWindowManager">
     <frame x="82" y="23" width="1280" height="797" extended-state="0" />
@@ -1006,6 +1016,7 @@
       <window_info id="Terminal" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="10" side_tool="false" content_ui="tabs" />
       <window_info id="Project" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.31744748" sideWeight="0.5" order="0" side_tool="false" content_ui="combo" />
       <window_info id="Bean Validation" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="8" side_tool="false" content_ui="tabs" />
+      <window_info id="Find" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
       <window_info id="Theme Preview" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="9" side_tool="false" content_ui="tabs" />
       <window_info id="Favorites" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="6" side_tool="true" content_ui="tabs" />
       <window_info id="Cvs" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="4" side_tool="false" content_ui="tabs" />
@@ -1013,7 +1024,6 @@
       <window_info id="Commander" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.4" sideWeight="0.5" order="0" side_tool="false" content_ui="tabs" />
       <window_info id="Hierarchy" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="2" side_tool="false" content_ui="combo" />
       <window_info id="Inspection" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.4" sideWeight="0.5" order="5" side_tool="false" content_ui="tabs" />
-      <window_info id="Find" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
     </layout>
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -1089,13 +1099,6 @@
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/resources/static/image/book/new course.jpg" />
-    <entry file="file://$PROJECT_DIR$/src/main/java/com/bookstore/domain/Book.java">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="180">
-          <caret line="18" column="0" lean-forward="true" selection-start-line="18" selection-start-column="0" selection-end-line="18" selection-end-column="0" />
-        </state>
-      </provider>
-    </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/com/bookstore/domain/BillingAddress.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="150">
@@ -1379,11 +1382,19 @@
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/com/bookstore/resource/UserResource.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="170">
+        <state relative-caret-position="575">
           <caret line="207" column="85" lean-forward="true" selection-start-line="207" selection-start-column="85" selection-end-line="207" selection-end-column="85" />
           <folding />
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/bookstore/domain/Book.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="270">
+          <caret line="23" column="29" lean-forward="true" selection-start-line="23" selection-start-column="29" selection-end-line="23" selection-end-column="29" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
   </component>
 </project>
\ No newline at end of file
diff --git a/bookstore-api/src/main/java/com/bookstore/domain/Book.java b/bookstore-api/src/main/java/com/bookstore/domain/Book.java
index 370c914..7d490ac 100644
--- a/bookstore-api/src/main/java/com/bookstore/domain/Book.java
+++ b/bookstore-api/src/main/java/com/bookstore/domain/Book.java
@@ -5,7 +5,6 @@ import org.springframework.web.multipart.MultipartFile;
 
 import javax.persistence.*;
 import java.io.Serializable;
-import java.util.Date;
 import java.util.List;
 
 /**
@@ -28,7 +27,7 @@ public class Book implements Serializable{
     private String category;
     private int numberOfPages;
     private String format;
-    private int isbn;
+    private String isbn;
     private double shippingWeight;
     private double listPrice;
     private double ourPrice;
@@ -121,11 +120,11 @@ public class Book implements Serializable{
         this.format = format;
     }
 
-    public int getIsbn() {
+    public String getIsbn() {
         return isbn;
     }
 
-    public void setIsbn(int isbn) {
+    public void setIsbn(String isbn) {
         this.isbn = isbn;
     }
 
diff --git a/bookstore-api/src/main/resources/static/image/book/20.png b/bookstore-api/src/main/resources/static/image/book/20.png
new file mode 100644
index 0000000..f10d73d
Binary files /dev/null and b/bookstore-api/src/main/resources/static/image/book/20.png differ
diff --git a/bookstore-api/target/classes/com/bookstore/domain/Book.class b/bookstore-api/target/classes/com/bookstore/domain/Book.class
index 79df467..4ba7a11 100644
Binary files a/bookstore-api/target/classes/com/bookstore/domain/Book.class and b/bookstore-api/target/classes/com/bookstore/domain/Book.class differ
diff --git a/bookstore-api/target/classes/static/image/book/20.png b/bookstore-api/target/classes/static/image/book/20.png
new file mode 100644
index 0000000..f10d73d
Binary files /dev/null and b/bookstore-api/target/classes/static/image/book/20.png differ