Dewey, M. (1951). Decimal classification & relative index (Standard (15th) ed. rev.). Forest Press.
Dyfyniad Arddull ChicagoDewey, Melvil. Decimal Classification & Relative Index. Standard (15th) ed. rev. Lake Placid Club, N.Y.: Forest Press, 1951.
Dyfyniad MLADewey, Melvil. Decimal Classification & Relative Index. Standard (15th) ed. rev. Forest Press, 1951.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.