Cita APA (7th ed.)

Purves, W. K., & Orians, G. H. (1983). Life: The science of biology. W. Grant Press.

Cita Chicago (17th ed.)

Purves, William Kirkwood, i Gordon H. Orians. Life: The Science of Biology. Sinauer Associates: W. Grant Press, 1983.

Cita MLA (9th ed.)

Purves, William Kirkwood, i Gordon H. Orians. Life: The Science of Biology. W. Grant Press, 1983.