Rdzogs chen yaṅ rtse lta ba thog dbab rtsa ʼgrel : precepts of Bonpo Dzogchen practice received in a vision of Tshe-dbaṅ-rig-ʼdzin - Rig-pa-raṅ-śar, Rgyal-roṅ-pa (distributor Tibetan Bonpo Monastic Centre, 1974)