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-referens (17:e uppl.)World Fertility Survey och 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-referens (8:e uppl.)World Fertility Survey och Samuel Baum. The World Fertility Survey Inventory, Major Fertility and Related Surveys Conducted in Africa 1960-1973. International Statistical Institute ; World Fertility Survey, 1974.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.