APA استشهاد

Simpson, G. G. (2012). Principles of animal taxonomy. Scientific Publishers.

استشهاد بنمط شيكاغو

Simpson, George Gaylord. Principles of Animal Taxonomy. New Delhi: Scientific Publishers, 2012.

MLA استشهاد

Simpson, George Gaylord. Principles of Animal Taxonomy. Scientific Publishers, 2012.