APA (7th ed.) Citation

Walcott, C. D. (1891). Correlation papers: Cambrian. Department of the Interior, United States Geological Survey.

Chicago Style (17th ed.) Citation

Walcott, Charles D. Correlation Papers: Cambrian. Washington, D.C.: Department of the Interior, United States Geological Survey, 1891.

MLA (9th ed.) Citation

Walcott, Charles D. Correlation Papers: Cambrian. Department of the Interior, United States Geological Survey, 1891.