Ladley, C. (1990). Drugs, society and behavior 90/91 (5th.ed.). Dushkin.
Lua i Stíl Chicago (17ú heag.)Ladley, Charles. Drugs, Society and Behavior 90/91. 5th.ed. Gilford: Dushkin, 1990.
Lua MLA (9ú heag.)Ladley, Charles. Drugs, Society and Behavior 90/91. 5th.ed. Dushkin, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.