Cita APA (7th ed.)
Ulrich, E. O., & Cooper, G. A. (1938). Ozarkian and Canadian Brachiopoda.
Cita Chicago (17th ed.)
Ulrich, Edward Oscar, i Gustav Arthur Cooper. Ozarkian and Canadian Brachiopoda. New York, 1938.
Cita MLA (9th ed.)
Ulrich, Edward Oscar, i Gustav Arthur Cooper. Ozarkian and Canadian Brachiopoda. 1938.
Atenció: Aquestes cites poden no estar 100% correctes.