1. The Alan Guttmacher Institute: 11 Million Teenagers. New York, Planned Parenthood Federation of America, 1976, pp 7–12
2. The Alan Guttmacher Institute: Teenager Pregnancy: The Problem That Hasn’t Gone Away. New York, Planned Parenthood Federation of America, 1981
3. Freeman EW, Rickels K: Adolescent contraception use: Current status of practice and research. Obstet Gynecol 53:338–394, 1979
4. Hendricks LE: Unmarried Adolescent Fathers: Problems They Face and Ways They Cope with Them, Final Report, Mental Health Research and Development Center, Institute for Urban Affairs and Research, Howard University, Washington, DC, September 1979
5. Baily LB, Mahan CS, Dimperio D: Folacin and iron status in low-income pregnant adolescents and mature women. Am J Nutr 33(9): 1997–2001, September 1980