MANHART, Michael; DUANE, Marguerite; LIND, April; SINAI, Irit; GOLDEN-TEVALD, Jean. Fertility awareness-based methods of family planning: A review of effectiveness for avoiding pregnancy using SORT. Osteopathic Family Physician, [S. l.], v. 5, n. 1, p. 2–8, 2013. Disponível em: https://ofpjournal.com/index.php/ofp/article/view/294. Acesso em: 3 may. 2024.