diff --git a/app/helpers/admin/personal_books_helper.rb b/app/helpers/admin/personal_books_helper.rb
index 1628334..12e1111 100644
--- a/app/helpers/admin/personal_books_helper.rb
+++ b/app/helpers/admin/personal_books_helper.rb
@@ -5,7 +5,7 @@ module Admin::PersonalBooksHelper
     split_text = split_text.nil? ? '/' : split_text[0]
     full_authors_names = get_member(book).collect(&:name)
     if authors_text.present?
-      authors_names = authors_text.split(split_text).select{|a| !(full_authors_names.include?(full_authors_names))}
+      authors_names = authors_text.split(split_text).select{|a| !(full_authors_names.include?(a.strip()))}
       full_authors_names += authors_names
     end
     full_authors_names.join(split_text)
@@ -21,7 +21,7 @@ module Admin::PersonalBooksHelper
       "<a href='#{OrbitHelper.url_to_plugin_show(member.to_param,'member')}' title='#{member_name}'>#{member_name}</a>"
     }
     if authors_text.present?
-      authors_names = authors_text.split(split_text).select{|a| !(full_authors_names.include?(full_authors_names.strip()))}
+      authors_names = authors_text.split(split_text).select{|a| !(full_authors_names.include?(a.strip()))}
       full_authors += authors_names
     end
     full_authors.join(split_text)