Cita APA (7th ed.)
Purves, W. K., Heller, H. C., & Orians, G. H. (1983). Life: The science and biology. Sinauer.
Cita Chicago (17th ed.)
Purves, William K., H. Craig Heller, i Gordon H. Orians. Life: The Science and Biology. New York: Sinauer, 1983.
Cita MLA (9th ed.)
Purves, William K., et al. Life: The Science and Biology. Sinauer, 1983.
Atenció: Aquestes cites poden no estar 100% correctes.