Cita APA (7a ed.)

Purves, W. K., Sadava, D., Orians, G. H., & Heller, H. C. Life: The science of biology (Seventh edition.).

Cita Chicago Style (17a ed.)

Purves, William K., David Sadava, Gordon H. Orians, y H. Craig Heller. Life: The Science of Biology. Seventh edition.

Cita MLA (9a ed.)

Purves, William K., et al. Life: The Science of Biology. Seventh edition.