An introduction to the A-khrid practices of Bonpo realisation, being the text of Man ngag rin po che a khrid thum mtshams bco lnga pa'i sngon 'gro'i khrid rim bka' lung rgya mtsho by Shar-rdza Bkra-shis-rgyal-mtshan - bKra-śis-rgyal-mtshan, Śarrdza (1972)