Citazione Stile APA (7a Edizione)

Raven, P. H., & Johnson, G. B. (1991). Understanding biology (2nd ed.). Wm. C. Brown Publishers.

Citazione stile Chigago Style (17a edizione)

Raven, Peter H., e George B. Johnson. Understanding Biology. 2nd ed. Dubuque, IA: Wm. C. Brown Publishers, 1991.

Citatione MLA (9a ed.)

Raven, Peter H., e George B. Johnson. Understanding Biology. 2nd ed. Wm. C. Brown Publishers, 1991.