United Nations, D. o. E. a. S. A. (1970). Variables and questionaire for comparative fertility surveys: (Population Studies No. 45). United Nations.
Citace podle Chicago (17th ed.)United Nations, Dept. of Economic and Social Affairs. Variables and Questionaire for Comparative Fertility Surveys: (Population Studies No. 45). New York: United Nations, 1970.
Citace podle MLA (9th ed.)United Nations, Dept. of Economic and Social Affairs. Variables and Questionaire for Comparative Fertility Surveys: (Population Studies No. 45). United Nations, 1970.
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