diff --git a/BPASmartClient.Model/Book.cs b/BPASmartClient.Model/Book.cs
index 28548660..8fb3deee 100644
--- a/BPASmartClient.Model/Book.cs
+++ b/BPASmartClient.Model/Book.cs
@@ -1,5 +1,4 @@
-using BPA.Helper;
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;