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.
Creation and Completion - Essential Points of Tantric Meditation — by Jamgon Kongtrul
This work represents some of the most profound teachings of Jamgon Kongtrul with a commentary by Thrangu Rinpoche and a long, thoughtful introduction on visualization practice. Even though advanced practitioners will want to study this book, it's also designed to help beginners.