Cita APA (7a ed.)

Guy, F., Tettamanzi, D., & Zimmerman, A. (1980). Natural family planning: Naturés way, god's way. De Rance.

Cita Chicago Style (17a ed.)

Guy, François, Dionigi Tettamanzi, y Anthony Zimmerman. Natural Family Planning: Naturés Way, God's Way. Milwaukee: De Rance, 1980.

Cita MLA (9a ed.)

Guy, François, et al. Natural Family Planning: Naturés Way, God's Way. De Rance, 1980.