Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

Purves, William K., i Gordon H. Orians. Life: The Science of Biology. Sunderland, Mass.: Sinauer Associates, 1983.

Cita MLA (9th ed.)

Purves, William K., i Gordon H. Orians. Life: The Science of Biology. Sinauer Associates, 1983.