Forinash, Alicia B, et al. “The use of galactogogues in the breastfeeding mother.” The Annals of pharmacotherapy 46.10 (2012):1392-1404.

Roy, Geneviève. “Injectable contraception.” Seminars in reproductive medicine 28.2 (2010):126-132.

Zuppa, Antonio A, et al. “Safety and efficacy of galactogogues: substances that induce, maintain and increase breast milk production.” Journal of pharmacy & pharmaceutical sciences 13.2 (2010):162-174.
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Curtis, Kathryn M, Camaryn EChrisman, and Herbert BPeterson. “Contraception for women in selected circumstances.” Obstetrics and gynecology 99.6 (2002):1100-1112.

Kelsey, J J. “Hormonal contraception and lactation.” Journal of human lactation 12.4 (1996):315-318.

World Health Organization

CDC

Search CINAHL and PubMed on concepts of breastfeeding, medroxyprogesterone and Depo Provera. Also, searched WHO and CDC websites.