References
- John Paul Pope. 2006. Man and woman he created them: A theology of the body. Translated by , Waldstein Michael. Boston: Pauline Books and Media. Introduction: Page 1.
- McCrystal P. 2002. Who's at the center of your marriage…The Pill or Jesus Christ? Human Life International (Ireland), 77, 150 pp., referencing Wilson, Mercedes. 2002. The practice of natural family planning. Catholic Social Sciences Review, VII: 1–30.
- Peck R., Norris C.. 2012. Significant risks of oral contraceptives (OCP's): Why this drug class should not be included in a preventive care mandate. Linacre Quarterly 79: 41–56.
- Rice C. E. 1995. 50 questions on the natural law. San Francisco, CA: Ignatius Press. Questions n. 6, pp. 43–9, and n. 42, pp. 252–8.
- Vigil P., Blackwell L. F., Cortes M. E.. 2012. The importance of fertility awareness in the assessment of a woman's health. A review. Linacre Quarterly 79: 426–450.
- Wojtyla K. C., et al. 2012. The foundation of the Church's doctrine concerning the principles of Conjugal life. Nova et Vetera [English Edition] 10(2): 321–59.