Cita APA (7a ed.)

Penn, C., Wallace, W., & Rowley, J. (1988). Two mothers: The story of the film. International Planned Parenthood Federation (IPPF).

Cita Chicago Style (17a ed.)

Penn, Caroline, Wendy Wallace, y John Rowley. Two Mothers: The Story of the Film. London: International Planned Parenthood Federation (IPPF), 1988.

Cita MLA (9a ed.)

Penn, Caroline, et al. Two Mothers: The Story of the Film. International Planned Parenthood Federation (IPPF), 1988.