Cravotta, C. A. (2002). Use of stable isotopes of carbon, nitrogen, and sulfur to identify sources of nitrogen in surface waters in the lower Susquehanna River Basin, Pennsylvania. U.S. G.P.O.] For sale by the U.S. Geological Survey, Branch of Information Services.
Cita Chicago (17th ed.)Cravotta, Charles A. Use of Stable Isotopes of Carbon, Nitrogen, and Sulfur to Identify Sources of Nitrogen in Surface Waters in the Lower Susquehanna River Basin, Pennsylvania. [Washington, D.C., Denver CO: U.S. G.P.O.] For sale by the U.S. Geological Survey, Branch of Information Services, 2002.
Cita MLA (9th ed.)Cravotta, Charles A. Use of Stable Isotopes of Carbon, Nitrogen, and Sulfur to Identify Sources of Nitrogen in Surface Waters in the Lower Susquehanna River Basin, Pennsylvania. U.S. G.P.O.] For sale by the U.S. Geological Survey, Branch of Information Services, 2002.