1. Inciardi James A., ?Beyond Cocaine: Basuco, Crack and Other Coca Products,?Contemporary Drug Problems, 1987 (14), 460?492.
2. Reinarman, Craig and Harry J. Levine, ?The Crack Attack: Politics and Media in America's Latest Drug Scare,? in Joel Best (ed.),Images and Issues: Current Perspectives on Social Problems (New York: Adeline de Gruyer, 1989).