APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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