Editing and translations by David Snellgrove with guidance from His Holiness Menri Trizin 33rd, His Eminence Yongdzin Lopon Tenzin Namdak Rinpoche, and Geshe Samten Karmay.
New paperback edition published in 2010 by Orchid Press. Originally published by Oxford U.P. in 1967. 312 pages