Dyfyniad APA

Dewey, M. (1979). Dewey Decimal Classification and Relative Index (19th ed.). Forest Press.

Dyfyniad Arddull Chicago

Dewey, Melvil. Dewey Decimal Classification and Relative Index. 19th ed. New York: Forest Press, 1979.

Dyfyniad MLA

Dewey, Melvil. Dewey Decimal Classification and Relative Index. 19th ed. Forest Press, 1979.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.