Bibliography
Dunnell, Ruth. 1992. “The Hsia Origins of the Yüan Institution of Imperial Preceptor.” Asia Major. Third Series, Vol. 5, part 1, pp. 85-111.
Sperling, Elliot. 1987. “Lama to the King of Hsia.” The Journal of the Tibet Society, vol. 7, pp. 31-50.
Sperling, Elliot. 1994. “Rtsa-mi lo-tsā-ba Sangs-rgyas grags-pa and the Tangut Background to Early Mongol-Tibetan Relations.” In Per Kvaerne, ed., Tibetan Studies. Proceedings of the 6th Seminar of the International Association for Tibetan Studies, Oslo, pp. 801-824.