I don't have these books but am aware of who this person is and think she would know everything there is to know about grooming a yorkie.
Yorkie Haircuts Books Yorkie Maltese Haircuts Shih Tzu Haircuts Chinese Crested
In the "Grooming" section here there is a video by Marcella that shows how to groom a yorkie. Also another member here sells a DVD, I would recommend:
Crown Royal Yorkshire Terriers