Dyfyniad APA

Crawford. (1981). Plastic engineering (2nd ed.). Pergaman Press.

Dyfyniad Arddull Chicago

Crawford. Plastic Engineering. 2nd ed. NeewYork: Pergaman Press, 1981.

Dyfyniad MLA

Crawford. Plastic Engineering. 2nd ed. Pergaman Press, 1981.

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