ScienceDirect (Online service), Thorp, J. H., & Covich, A. P. (2001). Ecology and classification of North American freshwater invertebrates (2nd ed.). Academic Press.
Chicago Style (17th ed.) CitationScienceDirect (Online service), James H. Thorp, and Alan P. Covich. Ecology and Classification of North American Freshwater Invertebrates. 2nd ed. San Diego: Academic Press, 2001.
MLA (9th ed.) CitationScienceDirect (Online service), et al. Ecology and Classification of North American Freshwater Invertebrates. 2nd ed. Academic Press, 2001.
Warning: These citations may not always be 100% accurate.