ScienceDirect (Online service), Follett, R. F., & Hatfield, J. L. (2001). Nitrogen in the environment: Sources, problems, and management. Elsevier.
Chicago Style (17th ed.) CitationScienceDirect (Online service), R. F. Follett, and Jerry L. Hatfield. Nitrogen in the Environment: Sources, Problems, and Management. Amsterdam ; New York: Elsevier, 2001.
MLA (9th ed.) CitationScienceDirect (Online service), et al. Nitrogen in the Environment: Sources, Problems, and Management. Elsevier, 2001.
Warning: These citations may not always be 100% accurate.