Citazione Stile APA (7a Edizione)

U.S. Bureau of the Census. (1981). Demographic estimates for countries with a population of 10 million or more: 1981. U.S. Government Printing Office.

Citazione stile Chigago Style (17a edizione)

U.S. Bureau of the Census. Demographic Estimates for Countries with a Population of 10 Million or More: 1981. Washington, D.C: U.S. Government Printing Office, 1981.

Citatione MLA (9a ed.)

U.S. Bureau of the Census. Demographic Estimates for Countries with a Population of 10 Million or More: 1981. U.S. Government Printing Office, 1981.