World Fertility Survey & Baum, S. (1974). The World Fertility Survey inventory, major fertility and related surveys conducted in Africa 1960-1973. International Statistical Institute ; World Fertility Survey.
Chicago-viite (17. p.)World Fertility Survey ja Samuel Baum. The World Fertility Survey Inventory, Major Fertility and Related Surveys Conducted in Africa 1960-1973. Voorburg : London: International Statistical Institute ; World Fertility Survey, 1974.
MLA-viite (8. p.)World Fertility Survey ja Samuel Baum. The World Fertility Survey Inventory, Major Fertility and Related Surveys Conducted in Africa 1960-1973. International Statistical Institute ; World Fertility Survey, 1974.
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