rGyal bstan spyi dan bye brag Rje btsun Sa-skya-pai bstan pa bstan dzin dan bcas pa byon tshul gyi rnam par thar pa sin tu mdor bsdus pa no mtshar rgya mtshoi chu thig ces bya ba bzugs so : Historical facts on the religion of the Sa-sKya-pa sect
Sherab Gyaltsen Amipa
Bok Tib 1970