Bibliography
Achard, Jean-Luc. 2007.Les Instructions sur le A Primordial —Volume I : Histoire de la Lignée. Sumène: Editions Khyung-Lung, pp. 39-43.
Per Kvaerne. 1973. "Bonpo Studies I: The A-khrid System of Meditation." Kailash I, no. 1: 1-50.
Shar rdza bKra shis rgyal mtshan. 1990.Man ngag rin po che a khrid kyi bla ma brgyud pa'i rnam thar padma dkar po'i phreng ba ces bya ba. InShar rdza bka' 'bum, vol. 13, pp. 1-90. Chamdo.