1. Bongaarts J, Cleland J, Townsend JW, Bertrand JT, Gupta MD. Family planning programs for the 21st century. New York: Population Council; 2012.
2. Singh S, Darroch JE, Vlassoff M, Nadeau J. Adding it up: the benefits of investing in sexual and reproductive health care. New York: Alan Guttmacher Institute; 2013.
3. National Research Council, Institute of Medicine. The science of adolescent risk-taking: workshop report. Washington: National Academies Press; 2011. p. 6–33.
4. MacQuarrie K. Unmet need for family planning among young women: levels and trends. DHS comparative reports no.34. Rockville: ICF International; 2014.
5. Cleland J, Conde-Agudelo A, Peterson H, Ross J, Tsui A. Contraception and health. Lancet. 2012;380(9837):149–56.