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[3] “Chapter 4: Natural Family Planning.” Journal of Obstetrics and Gynecology Canada, 2015, www.jogc.com/article/S1701-2163(16)39375-6/pdf . Accessed August 2023.
[4] “How Effective?” Family Planning: A Global Handbook for Providers, 2022, fphandbook.org/how-effective-1 . Accessed August 2023.
[5] “Contraception Methods.” The Society of Obstetricians and Gynecologists of Canada, 2016, www.sexandu.ca/wp-content/uploads/2016/09/Contraception_Methods_Booklet.pdf . Accessed August 2023.
