The references used on this website are as follows:
Dilgo Khyentse Rinpoche. The Excellent Path to Enlightenment. Boulder, Colorado: Snow Lion, 1996.
Dudjom Rinpoche, Jigdrel Yeshe Dorje. A Torch Lighting the Way to Freedom. Shambhala. Kindle Edition.
Mingyur Rinpoche, Yongey. Turning Confusion into Clarity: A Guide to the Foundation Practices of Tibetan Buddhism. Shambhala. Kindle Edition.
Rabten, Geshe. The Preliminary Practices of Tibetan Buddhism. Translated by Gonsar Tulku. Compiled by Georges Driessens. Library of Tibetan Works and Archives, 1974.
Rinpoche, Khenchen Thrangu. Essentials of Mahamudra: Looking Directly at the Mind. Wisdom Publications. Kindle Edition.
Rinpoche, Khenchen Thrangu. Four Foundations of Buddhist Practice. Namo Buddha Publications. Kindle Edition.
Rinpoche, Khandro. This Precious Life: Tibetan Buddhist Teachings on the Path to Enlightenment. Shambhala. Kindle Edition.
Thondup, Tulku. Enlightened Journey: Buddhist Practice as Daily Life. Edited by Harold Talbott. Boulder, CO: Shambhala Publications, 2016.
Tromge, Jane. Ngondro Commentary: Instructions for the Concise Preliminary Practices. Padma Publishing. Kindle Edition.