APA (7th ed.) Citation

Walcott, C. D. (1884). On the Cambrian faunas of North America: Preliminary studies. Department of the Interior, United States Geological Survey.

Chicago Style (17th ed.) Citation

Walcott, Charles D. On the Cambrian Faunas of North America: Preliminary Studies. Washington, D.C.: Department of the Interior, United States Geological Survey, 1884.

MLA (9th ed.) Citation

Walcott, Charles D. On the Cambrian Faunas of North America: Preliminary Studies. Department of the Interior, United States Geological Survey, 1884.