Cita APA (7th ed.)

Raven, P. H., & Johnson, G. B. (2011). Biology (Ninth Edition.). McGraw-Hill.

Cita Chicago (17th ed.)

Raven, Peter H., i George B. Johnson. Biology. Ninth Edition. Boston: McGraw-Hill, 2011.

Cita MLA (9th ed.)

Raven, Peter H., i George B. Johnson. Biology. Ninth Edition. McGraw-Hill, 2011.