“Lama Tsongkhapa collected all these different points that the Buddha taught and composed commentaries, and subsequently, depending on these commentaries, Pabonka Rinpoche composed this practice so that we can have a convenient sadhana where we can go through the different points in one practice. Putting the different samayas and vows together into the categories of the root downfalls and then the secondary downfalls and the samayas was done by Lama Tsongkhapa. Pabonka Rinpoche composed this practice to make it easy to keep one’s vows and pledges and also to make it easier to access the essence.” — Khensur Geshe Jampa Teckchog,  A Drop From the Vast Ocean of Vows, Precepts and Samayas: An Essential Commentary on the Six Session Guru Yoga 

James A. Blumenthal Library Books

Berzin, Alexander. 1998. Kalachakra and Other Six-Session Yoga Texts.  Ithaca, NY: Snow Lion Publications. JABL

Gen Lamrimpa, B. Alan Wallace, and Pauly B. Fitze. 1999. Transcending Time: The Kālacakra Six-Session Guru Yoga. Boston: Wisdom Publications. JABL

Lobsang Tharchin, Sermey Khensur Rinpoche. 1999. Six-Session Guru Yoga: An Oral Commentary with a Detailed Explanation of the Bodhisattva and Tantric Vows. Howell, NJ: Mahayana Sutra and Tantra Press. JABL

Tenzin Gyatso, Dalai Lama XIV and Jeffrey Hopkins. 1999. Kālachakra Tantra: Rite of Initiation: For the Stage of Generation: A Commentary on the Text of Kay-Drup-Ge-Leg-Bel-Sang-Bo. Boston: Wisdom Publications. JABL

Commentaries, Practice, and Teachings Online

Khensur Geshe Jampa Tekchog: A Drop from the Vast Ocean of Vows, Precepts, and Samayas: An Essential Commentary on the Six Session Guru Yoga, 1986 — HappyMonksPublication: PDF 
This commentary was given by the Venerable Khensur Rinpoche Geshe Jampa Teckchok in Nalanda Monastery, France, in 1986; translated by Fedor Stracke; published by HappyMonksPublication in 2019.

Lama Zopa Rinpoche: Six Session Guru Yoga, 2020 — FPMT: eBook and PDF
This practice is restricted to only those with the appropriate tantric initiation. You need to have received an initiation (wang) of the yoga tantra or highest yoga tantra class in order to read this text.
Arranged by Phabongkha Dechen Nyingpo, translated by Joona Repo.

Ribur Rinpoche: Six Session Guru Yoga: 1999 Teaching — Jewel Heart: PDF
Unedited transcript for retreat study purposes only.
Not for distribution © 2023 Ribur Rinpoche with permission from Fabrizzio Palotti, translator 1999

Media

H.E. Zong Rinpoche: Commentary on Six-Session Guru Yoga, 2023 Audio
༄༅། །ཐུན་དྲུག་བླ་མའི་རྣལ་འབྱོར་བཞུགས་སྱོ།། Text author: Losang Chökyi Gyältsän, Pabongka Rinpoche, & Ngulchu Jedrung
Prerequisites: Highest Yoga Tantra Empowerments

Jhado Rinpoche: Six-session Guru Yoga and the Three Kayas at Maitripa College, 2022. Video
Rinpoche provides an explanation of the practice experience, detailing why and how the samaya of the Five Buddha Families and the practice of Taking the Three Kayas as the Path are integrated into the Six-session Guru Yoga in Highest Yoga Tantra