APA (7th ed.) Citation

Schopp, R. D., & Firda, G. D. (2008). Flood magnitude and frequency of the Delaware River in New Jersey, New York, and Pennsylvania. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Schopp, Robert D., and Gary D. Firda. Flood Magnitude and Frequency of the Delaware River in New Jersey, New York, and Pennsylvania. Reston, Va.: U.S. Geological Survey, 2008.

MLA (9th ed.) Citation

Schopp, Robert D., and Gary D. Firda. Flood Magnitude and Frequency of the Delaware River in New Jersey, New York, and Pennsylvania. U.S. Geological Survey, 2008.