Ray, O. S., & Ksir, C. (1996). Drugs, society & human behavior (7th ed.). Mosby.
Dyfyniad Arddull ChicagoRay, Oakley Stern, and Charles Ksir. Drugs, Society & Human Behavior. 7th ed. St. Louis: Mosby, 1996.
Dyfyniad MLARay, Oakley Stern, and Charles Ksir. Drugs, Society & Human Behavior. 7th ed. Mosby, 1996.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.