Cita APA (7a ed.)

Chronic,Halka. (1952). Molluscan fauna from the Permian Kaikab formation,Walnut Canyon,Arizona. Geological Society of America.

Cita Chicago Style (17a ed.)

Chronic,Halka. Molluscan Fauna from the Permian Kaikab Formation,Walnut Canyon,Arizona. New York - EEUU: Geological Society of America, 1952.

Cita MLA (8a ed.)

Chronic,Halka. Molluscan Fauna from the Permian Kaikab Formation,Walnut Canyon,Arizona. Geological Society of America, 1952.