B. J. Stewart, “Sa skya Paṇḍita on the defining characteristic and variegation of direct perception (based on his Tshad ma rigs gter with his auto-commentary and Go-rams pa’s sub-commentary providing contextual and subtextual clarification)”, AOV, vol. 11, no. 1, pp. 53–83, Jan. 2010, doi: 10.15388/AOV.2010.1.3658.