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Dewey, M. 1., & Custer, B. A. (1979). Dewey decimal classification and relative index (Ed. 19 /edited under the direction of Benjamin A. Custer.). Albany, New York: Forest Press.

Dewey, Melvil 1851-1931, and Benjamin A. Custer. Dewey Decimal Classification and Relative Index. Ed. 19 /edited under the direction of Benjamin A. Custer. Albany, New York: Forest Press, 1979.

Dewey, Melvil 1851-1931, and Benjamin A. Custer. Dewey Decimal Classification and Relative Index. Ed. 19 /edited under the direction of Benjamin A. Custer. Albany, New York: Forest Press, 1979.