Try Genetics of Chicken Colours. The tolbunt article is from it. There may be some more on the website; there should be ordering information, too. It is well-worth the cost.
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What I desperately need to do is paint a "breed standard" picture. This won't be terribly hard, I am a commercial artist and all, but I'm always so busy with work! It would probably be a ten hour project and I've just been lazy, LOL.
The chickens would probably look closest to a...