APA (7th ed.) Citation

Simpson, G. G. (1961). Principles of Animal Taxonomy. Columbia University Press. https://doi.org/10.7312/simp92414

Chicago Style (17th ed.) Citation

Simpson, George Gaylord. Principles of Animal Taxonomy. New York, NY: Columbia University Press, 1961. https://doi.org/10.7312/simp92414.

MLA (9th ed.) Citation

Simpson, George Gaylord. Principles of Animal Taxonomy. Columbia University Press, 1961. https://doi.org/10.7312/simp92414.