APA (7th ed.) Citation

Briggs, R. P., Davies, W. E., & Pomeroy, J. S. (1975). Landsliding in Allegheny County, Pennsylvania. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Briggs, Reginald P., William E. Davies, and John S. Pomeroy. Landsliding in Allegheny County, Pennsylvania. [Reston, Virginia]: United States Department of the Interior, Geological Survey, 1975.

MLA (9th ed.) Citation

Briggs, Reginald P., et al. Landsliding in Allegheny County, Pennsylvania. United States Department of the Interior, Geological Survey, 1975.