Savada, Andrea Matles: ”Theocratic Government, 1616-1907 – Consolidation and Defeat of Tibetan Invasions, 1616-51”, Bhutan: A Country Study. Washington: Library of Congress, 1991. Teoksen verkkoversio (viitattu 28.11.2010). (englanniksi)
web.archive.org
Background Note: Bhutan U.S. Department of State. Arkistoitu 28.11.2010. Viitattu 28.11.2010. (englanniksi)