Barker, G., Hirsch, J. S., & Neidell, S. (1990). Serving the future: An update on adolescent pregnancy prevention programs in developing countries. The Center for Population Options.
Citace podle Chicago (17th ed.)Barker, Gary, Jennifer S. Hirsch, a Shara Neidell. Serving the Future: An Update on Adolescent Pregnancy Prevention Programs in Developing Countries. Washington D.C: The Center for Population Options, 1990.
Citace podle MLA (9th ed.)Barker, Gary, et al. Serving the Future: An Update on Adolescent Pregnancy Prevention Programs in Developing Countries. The Center for Population Options, 1990.
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