diff --git a/SpringApp/library/src/main/java/com/ip/library/controllers/users/UserBookController.java b/SpringApp/library/src/main/java/com/ip/library/controllers/users/UserBookController.java
index 0a6291e..1b9b300 100644
--- a/SpringApp/library/src/main/java/com/ip/library/controllers/users/UserBookController.java
+++ b/SpringApp/library/src/main/java/com/ip/library/controllers/users/UserBookController.java
@@ -26,6 +26,8 @@ public class UserBookController {
     private static final String BOOK_SEARCH_VIEW = "book-search";
     private static final String USER_FAVORITES_VIEW = "user-favorites";
     private static final String PAGE_ATTRIBUTE = "page";
+    private static final String AUTHOR_ATTRIBUTE = "authorId";
+    private static final String TYPE_ATTRIBUTE = "typeId";
 	
 	private final UserService userService;
 	private final BookService bookService;
@@ -84,8 +86,8 @@ public class UserBookController {
     @GetMapping(Constants.API_URL + "/search")
     public String getAll(
             @RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page,
-            @RequestParam(name = "typeId", defaultValue = "-1") Long typeId,
-            @RequestParam(name = "authorId", defaultValue = "-1") Long authorId,
+            @RequestParam(name = TYPE_ATTRIBUTE, defaultValue = "-1") Long typeId,
+            @RequestParam(name = AUTHOR_ATTRIBUTE, defaultValue = "-1") Long authorId,
             Model model) {
         final Map<String, Object> attributes = PageAttributesMapper.toAttributes(
                 bookService.getAll(typeId, authorId, page, Constants.DEFUALT_PAGE_SIZE),