Some essentials for the Rockabilly fan's Library
Go Cat Go : Rockabilly Music and It's Makers by Craig Morrison
A great introduction to the Genre - Killer Discography and Song Index
Read this online at Amazon
The Rockabilly Legends : They Called It Rockabilly Before They Called It Rock And Roll by Jerry Naylor
Nice coffee table book with a great DVD that chronicles the big stars of the genre.
Good Rockin' Tonight : Sun Records and the Birth of Rock And Roll by Colin Escott and Martin Hawkins
Great study of the legendary Memphis studio, where it all started