Charles, Vignetta E.; Polis, Chelsea B.; Sridhara, Srinivas K.; Blum, Robert W. (2008). „Abortion and long-term mental health outcomes: A systematic review of the evidence”. Contraception. 78 (6): 436—450. PMID19014789. doi:10.1016/j.contraception.2008.07.005..
Charles, Vignetta E.; Polis, Chelsea B.; Sridhara, Srinivas K.; Blum, Robert W. (2008). „Abortion and long-term mental health outcomes: A systematic review of the evidence”. Contraception. 78 (6): 436—450. PMID19014789. doi:10.1016/j.contraception.2008.07.005..
How claims spread : cross-national diffusion of social problems. Best, Joel. New York: Aldine de Gruyter. . . 2001. стр. 59—61. ISBN978-0202306537. OCLC45023173.Недостаје или је празан параметар |title= (помоћ)