Dzogchen Upadesha Teachings of Rigzin Changchub Dorje, by Chögyal Namkhai Norbu

An oral commentary by Chögyal Namkhai Norbu on the Quintessential Instructions on the Main Practice, "From The Black Quintessence of the Unexelled Innermost Essence".
Foreword, Tibetan text translation, edited transcription of the commentary, and notes by Elio Guarisco.

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Tibetan title: bla med snying thig yang tig nag po las dngos gzhi'i don khri yang snying bcud dril bzhugs