APA (7th ed.) Citation

Stone, R. W., Barnsley, E. R., Hickok, W. O., & Mohr, C. E. (1932). Pennsylvania caves (Second edition.). Department of Internal Affairs, Topographic and Geologic Survey.

Chicago Style (17th ed.) Citation

Stone, Ralph W., Edward Roberts Barnsley, W. O. Hickok, and Charles E. Mohr. Pennsylvania Caves. Second edition. Harrisburg: Department of Internal Affairs, Topographic and Geologic Survey, 1932.

MLA (9th ed.) Citation

Stone, Ralph W., et al. Pennsylvania Caves. Second edition. Department of Internal Affairs, Topographic and Geologic Survey, 1932.