Here are some web sites and books that have been very helpful or inspiring to my work:

Web sites

Books

John Coffer - The Doer's Guide to Wet-Plate Photography, 2000

Jill Enfield - Jill Enfield's Guide to Photographic Alternative Processes, 2013

Quinn Jacobson - Chemical Pictures: The Wet Plate Collodion Book, 2013

Christopher JamesThe Book of Alternative Photographic Processes, 3rd edition, 2015

Mark Osterman & France Scully Osterman - Basic Collodion Technique: Ambrotype & Tintype, Version 5, 2013

Barbara Upton & John Upton - Photography, 2nd edition, 1981