The book I got and used is The Yorkshire Terrier Handbook... here is the link at Amazon:
http://www.amazon.com/gp/product/076...468065-6949702
I really don't know anything about litter training... my little one is being pee pad trained.
Regarding barking, I think it varys from dog to dog. My litte Eury almost never barks except in her sleep and when she is playing with our cats. I've heard of some barking a lot and others almost never.
I'm in the process of switching to Royal Canin. They have one that is specifically for Yorkies. I'm overseas so I have to order it. I dunno about Stateside.