Heimbel, Jörg. 2017. Vajradhara in Human Form: The Life and Times of Ngor chen Kun dga' bzang po. Kathmandu: Lumbini International Research Institute, p. 267, note #237.
The TBRC RID number refers to the unique ID assigned by the Tibetan Buddhist Resource Center (TBRC.org) to each historical figure in their database of Tibetan literature.