International Demographic Data Center (U.S.), Jamison, E., & Spitler, J. F. (1980). International population dynamics, 1950-79: Demographic estimates for countries with a population of 5 million or more. The Bureau : for sale by the Supt. of Docs., U.S. Govt. Print. Off.

International Demographic Data Center (U.S.), Ellen Jamison, и James F. Spitler. International Population Dynamics, 1950-79: Demographic Estimates for Countries with a Population of 5 Million or More. Washington, D.C: The Bureau : for sale by the Supt. of Docs., U.S. Govt. Print. Off, 1980.

International Demographic Data Center (U.S.), et al. International Population Dynamics, 1950-79: Demographic Estimates for Countries with a Population of 5 Million or More. The Bureau : for sale by the Supt. of Docs., U.S. Govt. Print. Off, 1980.