Probably the best book available on the subject is "Seitengewehr: History of the German Bayonet 1919-1945" by George T. Wheeler. Hardbound - 328 pg. Unfortunately, it is out of print and fairly expensive on the collector market. This link should get you started: https://www.google.com/#hl=en&tbo=d...ba8070072772da&bpcl=38897761&biw=1215&bih=568
Another less expensive, but also less extensive is a 68 pg. paperback - "Reichswehr and Wehrmacht Bayonets 1920-1945" by Mike Welser. I think this can still be bought directly from the author for the $20-$25 range. The last address I have for Mike is:
Mike Welser
P.O. Box 3285
Quincy, CA 95971