India. Director of Census Operations, Sikkim, & Thapa, J. K. (1981). Provisional population totals, series 19, Sikkim: Paper 1 of 1981. Manager, Govt. of India Press.
Chicago Style (17th ed.) CitationIndia. Director of Census Operations, Sikkim, and J. K. Thapa. Provisional Population Totals, Series 19, Sikkim: Paper 1 of 1981. New Delhi: Manager, Govt. of India Press, 1981.
MLA (8th ed.) CitationIndia. Director of Census Operations, Sikkim, and J. K. Thapa. Provisional Population Totals, Series 19, Sikkim: Paper 1 of 1981. Manager, Govt. of India Press, 1981.
Warning: These citations may not always be 100% accurate.