Batty, C. (1981). An introduction to the nineteenth edition of the Dewey Decimal classification. Clive Bingley.
Dyfyniad Arddull ChicagoBatty, C.D. An Introduction to the Nineteenth Edition of the Dewey Decimal Classification. London: Clive Bingley, 1981.
Dyfyniad MLABatty, C.D. An Introduction to the Nineteenth Edition of the Dewey Decimal Classification. Clive Bingley, 1981.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.