Reading suggestions about the history of Dzogchen

[Greg]

also interesting

"A Comparison of Alaya-vijnana In Yogacara and Dzogchen" by David F. Germano and William S. Waldron, in Buddhist Thought And Applied Psychological Research

[pensum]

Ch. 6 in Ronald Davidson's Tibetan Renaissance is interesting reading as well, especially the section about the term rigpa. You can read it here: http://www.scribd.com/doc/75369514/Tibetan-Renaissance-Tantric-Buddhism-in-the-Rebirth-of-Tibetan-Culture