Nortman, D. (1972). Population and family planning programs: A factbook (4th ed.). Population Council.
Citazione stile Chigago Style (17a edizione)Nortman, Dorothy. Population and Family Planning Programs: A Factbook. 4th ed. New York: Population Council, 1972.
Citatione MLA (9a ed.)Nortman, Dorothy. Population and Family Planning Programs: A Factbook. 4th ed. Population Council, 1972.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.