Guru Yoga - According to the Preliminary Practice of Longchen Nyingtik — by Dilgo Khyentse Rinpoche
This particular guru yoga is called "The Wish-fulfilling Jewel" and it is the outer practice of the guru from the Longchen Nyingtik revelation of Rigdzin Jigme Lingpa.
Tibetan Ritual — by J.I. Cabezon
This book brings together eleven essays by an international cast of scholars working on ritual texts, institutions and practices in the greater Tibetan cultural world.
Golden Letters - The Three Statements of Garab Dorje, First Dzogchen Master
The teachings of Dzogchen, which directly introduces the practitioner to the Nature of Mind, first expounded by Garab Dorje in the country of Uddiyana and later went to India and Tibet.
The Excellent Path to Enlightenment - Oral Teachings on the Root Text of Jamyang Khyentse Wangpo — by Dilgo Khyentse Rinpoche
This book explains a key practice text composed by Jamyang Khyentse Wangpo (1820–1892) on the Vajrayana preliminaries.
Nagarjuna's Precious Garland - Buddhist Advice for Living and Liberation — translated by Jeffrey Hopkins
The advice for personal happiness is concerned first with improving condition over the course of lifetimes, and then with release from all kinds of suffering, culminating in Buddhahood.
A Beginner's Guide to Tibetan Buddhism - Notes From a Practitioner's Journey — by Bruce Newman
This is a ground-level, practice-oriented presentation of Tibetan Buddhism - personal and very accessible.
Dispeller of Obstacles - The Heart Practice of Padmasambhava
This is the heart essence of the accomplished master Padmasambhava who perceives the three times in the entirety.
A Clear Mirror - The Visionary Autobiography of a Tibetan Master — Traktung Dudjom Lingpa
This is the autobiographical account of a saint, a genius, a virtuoso who has granted readers what is most rare in personal accounts: full access to his incredible inner life.
The Dzogchen - Innermost Essence Preliminary Practice — by Jigme Lingpa
This is not only a preliminary practice but actually provides a complete means in itself for attaining the fully awakened state.
The Essence of Buddhism - An Introduction to Its Philosophy and Practice — by Traleg Kyabgon
This lucid overview of the Buddhist path takes the perspective of the three "vehicles" of Tibetan Buddhism: the Hinayana, Mahayana, and Vajrayana.