Sonam Topgay Dorji (English Wikipedia)

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Vas, E. A. (1986). The dragon kingdom: journeys through Bhutan. Lancer International. p. 189. ISBN 81-7062-007-4. Retrieved 2011-08-12.
Rustomji, Nari (1971). Enchanted frontiers: Sikkim, Bhutan, and India's northeastern borderlands. Vol. 1. Oxford University Press. pp. 161–166. Retrieved 2011-08-12.
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carnegieendowment.org

"Indo-Bhutan Friendship Treaty" (PDF). Carnegie Endowment for International Peace. 1949-08-08. Retrieved 2011-08-12.

helvetas.org.bt

"History of Swiss Assistance". Helvetas – Bhutan. 2010-12-13. Archived from the original on 2011-07-25. Retrieved 2011-08-12.

web.archive.org

Dorji, Khandu-Om (2002). "A Brief History of Bhutan House in Kalimpong" (PDF). Archived from the original (PDF) on 2012-01-05. Retrieved 2011-08-12.
"History of Swiss Assistance". Helvetas – Bhutan. 2010-12-13. Archived from the original on 2011-07-25. Retrieved 2011-08-12.