Sidney Cohen. (1981). The substance abuse problems. New York: The Harworth Press.
Dyfyniad Arddull ChicagoSidney Cohen. The Substance Abuse Problems. New York: The Harworth Press, 1981.
Dyfyniad MLASidney Cohen. The Substance Abuse Problems. New York: The Harworth Press, 1981.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.