APA (7th ed.) Citation

Puckett, L. J. (1994). Nonpoint and point sources of nitrogen in major watersheds of the United States. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Puckett, Larry J. Nonpoint and Point Sources of Nitrogen in Major Watersheds of the United States. Reston, Va.: U.S. Geological Survey, 1994.

MLA (9th ed.) Citation

Puckett, Larry J. Nonpoint and Point Sources of Nitrogen in Major Watersheds of the United States. U.S. Geological Survey, 1994.