Worden, Robert L.; Savada, Andrea Matles (ed.) (1991) „Chapter 6: Bhutan - Ethnic Groups“, Nepal and Bhutan: Country Studies, 3rd, Federal Research Division, United States Library of Congress, გვ. 424. ISBN0-8444-0777-1. ციტირების თარიღი: 2010-10-02.
state.gov
Background Note: Bhutan. U.S. Department of State (2010-02-02). ციტირების თარიღი: 2010-10-02.