APA (7th ed.) Citation

Delo, D. M. (1940). Phacopid trilobites of North America. The Society.

Chicago Style (17th ed.) Citation

Delo, David M. Phacopid Trilobites of North America. [New York]: The Society, 1940.

MLA (8th ed.) Citation

Delo, David M. Phacopid Trilobites of North America. The Society, 1940.