Cita APA (7th ed.)

Raven, P. H., & Johnson, G. B. (1988). Understanding Biology (2nd.). Wm. C. Brown Publishers.

Cita Chicago (17th ed.)

Raven, Peter H., i George B. Johnson. Understanding Biology. 2nd. London: Wm. C. Brown Publishers, 1988.

Cita MLA (9th ed.)

Raven, Peter H., i George B. Johnson. Understanding Biology. 2nd. Wm. C. Brown Publishers, 1988.