Dyfyniad APA

Dewey, M. (1979). Dewey decimal classification and relative index (19th. ed.). Forest Press, a division of OCLC Online Computer Library Center.

Dyfyniad Arddull Chicago

Dewey, Melvil. Dewey Decimal Classification and Relative Index. 19th. ed. Albany, N.Y.: Forest Press, a division of OCLC Online Computer Library Center, 1979.

Dyfyniad MLA

Dewey, Melvil. Dewey Decimal Classification and Relative Index. 19th. ed. Forest Press, a division of OCLC Online Computer Library Center, 1979.

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