(1981) 'The rise of Changchub Gyaltsen and the Phagmo Drupa Period', "Bulletin of Tibetology", 1981 Gangtok: Namgyal Institute of Tibetology [http://www.thdl.org/texts/reprints/bot/bot_1981_01_02.pdf]*Shakapa, Tsepon W.D.
(1981) ""The rise of Changchub Gyaltsen and the Phagmo Drupa Period″ " in "Bulletin of Tibetology", 1981 Gangtok: Namgyal Institute of Tibetology [http://www.thdl.org/texts/reprints/bot/bot_1981_01_02.pdf]* Shakapa, Tsepon W.D.