Cita APA (7a ed.)

Cooper, A., & Dunbar, C. O. (1953). Permian fauna at el antimonio, western sonora, Mexico. Smithsonian Institution.

Cita Chicago Style (17a ed.)

Cooper, Arthur, y Carl O. Dunbar. Permian Fauna at El Antimonio, Western Sonora, Mexico. Washington, D. C: Smithsonian Institution, 1953.

Cita MLA (9a ed.)

Cooper, Arthur, y Carl O. Dunbar. Permian Fauna at El Antimonio, Western Sonora, Mexico. Smithsonian Institution, 1953.