APA (7th ed.) Citation

Piper, A. M., Foster, M. D., & Howard, C. S. (1933). Ground water in southwestern Pennsylvania. Dept. of Internal Affairs, Topographic and Geologic Survey.

Chicago Style (17th ed.) Citation

Piper, Arthur M., Margaret D. Foster, and C. S. Howard. Ground Water in Southwestern Pennsylvania. Harrisburg: Dept. of Internal Affairs, Topographic and Geologic Survey, 1933.

MLA (9th ed.) Citation

Piper, Arthur M., et al. Ground Water in Southwestern Pennsylvania. Dept. of Internal Affairs, Topographic and Geologic Survey, 1933.