Good Tai Chi Reference Books

After being asked by a few people what some good Tai Chi reference books are I decieded to just put it in a post:
T’ai Chi Ch’uan and Meditation – Da Liu. Excellent
T’ai Chi Classics – Waysun Liao
The Tao of Ch’i – Mark Dana, Mincolla – Good healing with Tai Chi reference.
Tao Te Ching – any edition – Basic Philosophy.
Anything by Mantak Chia – Plenty of good Taoist energy exercises.
Tao and T’ai Chi Kung – Robert C. Sohn.