The Guhyagarbha Tantra - Secret Essence Definitive Nature Just As It Is — by Longchenpa
This Secret Essence Tantra is the most advanced and extensively studied tantra within the Nyingma lineage. The author includes complete explanations of the peaceful and wrathful mandalas as well as practical instructions needed to attain the four states of vidyadharahood.
The Elements of Tantric Practice — by Jamgon Kongtrul - The Treasury of Knowledge - Volume 8
This volume concerns the meditative processes of the inner system of secret mantra - that of highest yoga tantra - a system of meditation that unites wisdom and compassion. The goal is to make manifest the pristine awareness that is the union of emptiness and bliss.
Systems of Buddhist Tantra — by Jamgon Kongtrul - The Treasury of Knowledge - Volume 6
This volume sets forth the various systems that constitute the tantric path, both those of the ancient tantra tradition and of the new tradition. A superb resource for advanced Buddhist practitioners students and scholars.
Essence of Clear Light - An Overview of the Secret Commentary Thorough Dispelling of Darkness throughout the Ten Directions — by Jamgon Mipham, translated by Lama Chonam & Sangye Khandro.
This commentary on the Secret Essence by Mipham Rinpoche illuminates all the crucial points of the entire path of Secret Mantra Vajrayana.
Luminous Essence - A Guide to the Guhyagarbha Tantra — by Ju Mipham
This is a complete introduction to the world of tantric thought and practice. Embodying the essence of tantric practice, this text has been a central scripture in Tibetan Buddhism for well over a thousand years.
Yoga Tantra - Paths to Magical Feats — by Tsongkhapa - with a commentary by Dalai Lama, translated by Jeffrey Hopkins
This book explores "paths to magical feats" through a dedicated practice of Yoga Tantra. It builds upon the practice of deity yoga, in which a person joins one's own body, speech, mind and activities with the exalted body, speech, mind and activities of a supramundane being.