Cita APA (7a ed.)

Ayala, F. J., & Head, J. J. (1983). Genetic variation and evolution. Carolina Biological Supply, Scientific Publications Department.

Cita Chicago Style (17a ed.)

Ayala, Francisco J., y J. J. Head. Genetic Variation and Evolution. Burlington, N.C.: Carolina Biological Supply, Scientific Publications Department, 1983.

Cita MLA (8a ed.)

Ayala, Francisco J., y J. J. Head. Genetic Variation and Evolution. Carolina Biological Supply, Scientific Publications Department, 1983.