Journey Without Goal - The Tantric Wisdom of the Buddha — by Chögyam Trungpa
Introduces to the principles of tantra, based on the practice of meditation, which leads to the discovery of egolessness.
Absorption in No External World - 170 Issues in Mind-Only Buddhism — by Jeffrey Hopkins
Dynamic Responses to Dzong-ka-ba's The Essence of Eloquence III
Machik's Complete Explanation - Clarifying the Meaning of Chod — with commentary by the 3rd Karmapa - Rangjung Dorje
This book is the most famous book of teachings of Machik Labdron - the great female saint and yogini of 11 and 12th century Tibet.