Steven Kossak, Painted Images of Enlightenment: Early Tibetan Thankas, 1050-1450 (Mumbai: Marg Foundation, 2010), 59-60, fig. 39.

Pratapaditya Pal, “An Early Tibetan Mandala of Ekallavira Achala in A Private Collection: An Art Historical Analyis”, Asianart.com, 9 September, 2013