--- a/Library/LibrarySystem/Core/Publisher.cs	Tue Apr 03 23:32:40 2012 +0100
+++ b/Library/LibrarySystem/Core/Publisher.cs	Wed Apr 04 19:20:20 2012 +0100
@@ -1,9 +1,23 @@
-using LibrarySystem.Interfaces;
+using System;
+using LibrarySystem.Interfaces;
 
 namespace LibrarySystem.Core
 {
     public class Publisher : IPublisher
     {
-        public string Name { get; set; }
+        public string Name { get; private set; }
+
+        private Publisher()
+        {
+            
+        }
+
+        public static IPublisher Create(string name)
+        {
+            if (name == null)
+                throw new ArgumentNullException();
+
+            return new Publisher() { Name = name };
+        }
     }
 }