Cita APA (7th ed.)

Krogh, D. (2011). Biology: A guide to natural world (5th ed.). Benjamin Cummings.

Cita Chicago (17th ed.)

Krogh, David. Biology: A Guide to Natural World. 5th ed. Boston: Benjamin Cummings, 2011.

Cita MLA (9th ed.)

Krogh, David. Biology: A Guide to Natural World. 5th ed. Benjamin Cummings, 2011.