Learning Spey/Salmon Flies

Been trying to learn some of the classic salmon and spey fly pattern for about a year now and can't do too good with them. I was wondering if anyone can recommend a good book to help learn these patterns from the basics. I'm decent at tying some dry flies, streamers, minnow patterns and eggs, but these flies elude my ability thus far.
Thanks

These are a few I looked at on Amazon:

Twenty Salmon Flies: Tying Techniques for Mastering the Classic Patterns from the Simplest to the Most Complex [With DVD]

Tying the Classic Salmon Fly: A Modern Approach to Traditional Techniques

Spey Flies and Dee Flies: Their History & Construction [Paperback]
John Shewey (Author)

For the classics - cannot go wrong with Reidenbach's book - "Twenty Salmon Flies" Fantastic tutes and explanations.

Thanks guys! Appreciate the help as always! They'll make good secret santa gifts.

Although Poul's book is a Classic(I own a signed copy) some of his techniques are quite different from the more recent Classic's. There are a couple of videos that Poul made, named Poul Jorgensen on Salmon Flies called Deadly Patterns, and Full Dressed Feather Wings.
By far the most informative books on Classic's are Radenchich's books, there are three
Tying The Classic Salmon Fly: Classic Salmon Fly Materials; and Twenty Salmon Flies(DVD included). As others have stated Shewy and Veverka are great additions and adress more of a fishing fly.Veverka has two that are great, one salt water and one Spey Flies And How To Tie Them, Shewy's Spey Flies And Dee Flies.
Good luck, you have now entered the Dark Side. Heres one for you to think about