Cita APA (7th ed.)

Krogh, D. (2005). Biology: A guide to the natural world (3rd ed.). Pearson Prentice Hall.

Cita Chicago (17th ed.)

Krogh, David. Biology: A Guide to the Natural World. 3rd ed. Upper Saddle River, N.J.: Pearson Prentice Hall, 2005.

Cita MLA (9th ed.)

Krogh, David. Biology: A Guide to the Natural World. 3rd ed. Pearson Prentice Hall, 2005.