Nortman, D. (1972). Population and family planning programs: A factbook (4th ed.). Population Council.
Chicago-referens (17:e uppl.)Nortman, Dorothy. Population and Family Planning Programs: A Factbook. 4th ed. New York: Population Council, 1972.
MLA-referens (9:e uppl.)Nortman, Dorothy. Population and Family Planning Programs: A Factbook. 4th ed. Population Council, 1972.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.