Ladley, C. (1990). Drugs, society and behavior 90/91 (5th.ed.). Dushkin.
Dyfyniad Arddull ChicagoLadley, Charles. Drugs, Society and Behavior 90/91. 5th.ed. Gilford: Dushkin, 1990.
Dyfyniad MLALadley, Charles. Drugs, Society and Behavior 90/91. 5th.ed. Dushkin, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.