Modell, W., & Lansing, A. j. a. (1980). Drugs (2d ed.). Time-Life Books.
Lua i Stíl Chicago (17ú heag.)Modell, Walter, agus Alfred joint auth Lansing. Drugs. 2d ed. Hongkong: Time-Life Books, 1980.
Lua MLA (9ú heag.)Modell, Walter, agus Alfred joint auth Lansing. Drugs. 2d ed. Time-Life Books, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.