Cita APA (7a ed.)

Barkley,Fred. A. (1943). An apology for Taxonomy.

Cita Chicago Style (17a ed.)

Barkley,Fred. A. An Apology for Taxonomy. -, 1943.

Cita MLA (8a ed.)

Barkley,Fred. A. An Apology for Taxonomy. 1943.