Muppathinchira, T. “Introduction to the Buddhist Tantric Systems: Translated From: Mkhas Grub Rje’s "Rgyud Sde Spyihi Rnam Par gz’ag Pa Rgyas Par brjod" With Original Text and Annotation”. Journal of Dharma, vol. 9, no. 3, June 1984, p. 298, https://dvkjournals.in/index.php/jd/article/view/1449.