Approach and Accomplishment of the Three Vajras
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Approach and Accomplishment of the Three Vajras (Wyl. rdo rje gsum gyi bsnyen sgrub) aka Orgyen Nyengyü (o rgyan bsnyen brgyud) — one of the eight practice lineages which was brought to Tibet by Orgyenpa Rinchen Pal. These teachings were given to him directly by Vajrayogini, when he travelled to Oddiyana.
- Ringu Tulku, The Ri-me Philosophy of Jamgön Kongtrul the Great (Boston & London: Shambhala Publications, 2007), pages 153-154 & 189-191.