The book that slowfinger is talking about is titled "Sturmgewehr! From Firepower to Striking Power" By Hans-Dieter Handrich, it is available from Collector Grade Publications. The title is a little corny but the book is good. There is also a book in the Propaganda Series titled "MkB42,MP43,MP44 And The Sturmgewehr 44" it doesn't have a lot of detailed information but it does have a lot of nice original photographs of the guns in use.