From Rigpa Wiki
Wyl. ma Ni bka' 'bum) - a collection of teachings and practices focused on Avalokiteshvara, attributed to King Songtsen Gampo and revealed as a terma by three different masters: the siddha Ngödrup, Nyangrel Nyima Özer, and Shakya Ö.
- Bryan Phillips, “Consummation and Compassion in Medieval Tibet: The Mani bka’-‘bum chen-mo of Guru Chos-kyi dbang-phyug” (unpublished PhD thesis)
- Matthew Kapstein, 'Remarks on the Maṇi bKa'-'bum and the Cult of Āvalokiteśvara in Tibet', in Tibetan Buddhism: Reason and Revelation edited by Steven D Goodman and Ronald M. Davidson, SUNY, 1992
- Matthew Kapstein, 'The Royal Way of Supreme Compassion', in Religions of Tibet in Practice, edited by Donald S. Lopez Jr., Princeton University Press, 1997