World Fertility Survey & Baum, S. (1974). The World Fertility Survey inventory, major fertility and related surveys conducted in Europe, North America and Australia 1960-1973. International Statistical Institute ; World Fertility Survey.
Παραπομπή σε μορφή Chicago (17η εκδ.)World Fertility Survey και Samuel Baum. The World Fertility Survey Inventory, Major Fertility and Related Surveys Conducted in Europe, North America and Australia 1960-1973. Voorburg : London: International Statistical Institute ; World Fertility Survey, 1974.
Παραπομπή σε μορφή MLA (8th εκδ.)World Fertility Survey και Samuel Baum. The World Fertility Survey Inventory, Major Fertility and Related Surveys Conducted in Europe, North America and Australia 1960-1973. International Statistical Institute ; World Fertility Survey, 1974.