Dyfyniad APA
Polsgrove, L. (1991). Reducing undesirable behaviors. Council for Exceptional Children.
Dyfyniad Arddull Chicago
Polsgrove, Lewis. Reducing Undesirable Behaviors. Reston, Va.: Council for Exceptional Children, 1991.
Dyfyniad MLA
Polsgrove, Lewis. Reducing Undesirable Behaviors. Council for Exceptional Children, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.