United Nations Department of Economic and Social Affairs. (1967). Methods of analysing census data on economic activities of the population. United Nations.
Cita Chicago (17th ed.)United Nations Department of Economic and Social Affairs. Methods of Analysing Census Data on Economic Activities of the Population. New York: United Nations, 1967.
Cita MLA (9th ed.)United Nations Department of Economic and Social Affairs. Methods of Analysing Census Data on Economic Activities of the Population. United Nations, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.