APA (7th ed.) Citation

Simpson, G. G. (1961). Principles of animal taxonomy / by George Gaylord Simpson. Oxford University Press.

Chicago Style (17th ed.) Citation

Simpson, George Gaylord. Principles of Animal Taxonomy / by George Gaylord Simpson. Oxford University Press, 1961.

MLA (9th ed.) Citation

Simpson, George Gaylord. Principles of Animal Taxonomy / by George Gaylord Simpson. Oxford University Press, 1961.

Warning: These citations may not always be 100% accurate.