Cita APA (7a ed.)
Penner, C. L., & Penner, J. (1992). Sex facts for the family. Word Publishing.
Cita Chicago Style (17a ed.)
Penner, Clifford L., y Joyce Penner. Sex Facts for the Family. Dallas: Word Publishing, 1992.
Cita MLA (9a ed.)
Penner, Clifford L., y Joyce Penner. Sex Facts for the Family. Word Publishing, 1992.
Precaución: Estas citas no son 100% exactas.