If you plan on breeding for show an invaluable book to own is American Standard of Perfection, current copy is 44th edition: http://www.amerpoultryassn.com/store.htm
The first 30 or so pages has good information on poultry in general there. Of course has detailed standards on each breed and breeds variety too with full illustrations for visual. You can always look up old editions online. It doesn't change much at all but a hard copy to put bookmarks in and easily read is handy.
Online copy of 1910 edition: https://archive.org/stream/americanstandard00ameriala#page/60/mode/2up
If it doesn't load up to start of Wyandotte section it's on page 61 in book.
Almost forgot. A group of breeders put together a CSU thread- Chicken State University. No longer active but about every breed was put in for discussion and available for viewing. You'll have to skim through it to find the section on Wyandotte. Long thread but they did try to block off sections to breed.
Edited by Egghead_Jr - 5/17/16 at 5:23am