- Aris (1979). "Bhutan: The Early Historyof a Himalayan Kingdom", by Michael Aris (Warminster: Aris & Phillips, 1979).
- Documents on Sikkim and Bhutan (1998). "Documents on Sikkim and Bhutan", ed. by S.K. Sharma and Usha Sharma (New Delhi: J.L. Kumar for Anmol Publications, 1998)
- Risley (1888). "History of Sikhim and its Rulers" by H.H. Risley in The Gazetter of Sikhim (Calcutta: Bengal Secretariat Press, 1894), 5-26 (web site)
- Tibetan and Himalayan Digital Library. THDL Extended Wylie Transliteration Scheme (web site). Last visited 12 May 2008.
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