Gtor ma brgya rtsaʼi rnam par bśad pa daṅ Dkar cha bźiʼi rnam bśad : explanations of the Sa-skya-pa traditions for performing the rites of the Gtor ma brgya rsta and Dkar cha bźi - Chos-rnam-rgyal, Rta-nag Thub-bstan Mkhan-po (Sherab Gyaltsen, 1979)