Karlsson, Klemens. Face to face with the absent Buddha: The formation of Buddhist Aniconic art. Diss. Acta Universitatis Upsaliensis, 2000.[1]Archived 2021-10-01 at the Wayback Machine
Vollmer, Klaus (2006). "Buddhism and Violence"(PDF). The Lumbini International Research Institute. Archived(PDF) from the original on 2020-09-20. Retrieved 15 October 2021.
Karlsson, Klemens. Face to face with the absent Buddha: The formation of Buddhist Aniconic art. Diss. Acta Universitatis Upsaliensis, 2000.[1]Archived 2021-10-01 at the Wayback Machine
Vollmer, Klaus (2006). "Buddhism and Violence"(PDF). The Lumbini International Research Institute. Archived(PDF) from the original on 2020-09-20. Retrieved 15 October 2021.
"Footprints of the Buddha". Buddha Dharma Education Association Inc. 2008. Archived from the original on 2019-04-13. Retrieved 2008-05-11.