Stages of the Buddha's teachings : three key texts : Dölpa ; Gampopa ; and Sakya Paṇḍita - Roesler, Ulrike; Holmes, Ken; Jackson, David Paul; Shes-rab-rgya-mtsho, Dol-pa, 1059-1131; Sgam-po-pa, 1079-1153; Sa-skya Paṇḍi-ta Kun-dgaʼ-rgyal-mtshan, 1182-1251 (Library of Tibetan classics, 2015)