Cita APA (7a ed.)

McCarthy Jr., J. J., & Martin, M. C. (1980). Fertility awareness: An instructional program with charts and text. The Human Life and Natural Family Planning Foundation.

Cita Chicago Style (17a ed.)

McCarthy Jr., John J., y Mary Catherine Martin. Fertility Awareness: An Instructional Program with Charts and Text. Washington, D.C.: The Human Life and Natural Family Planning Foundation, 1980.

Cita MLA (9a ed.)

McCarthy Jr., John J., y Mary Catherine Martin. Fertility Awareness: An Instructional Program with Charts and Text. The Human Life and Natural Family Planning Foundation, 1980.