Cita APA (7a ed.)

Simpson, G. G. (1961). Principles of animal taxonomy. Columbia University Press.

Cita Chicago Style (17a ed.)

Simpson, George Gaylord. Principles of Animal Taxonomy. New York: Columbia University Press, 1961.

Cita MLA (8a ed.)

Simpson, George Gaylord. Principles of Animal Taxonomy. Columbia University Press, 1961.