U.S. Sentencing Commission 1998 Federal Sourcebook of Federal Sentencing Statistics, 1998. Washington, DC: U.S. Government Printing Office.
Weatherburn, D., and B. Lind 1996 Drug law enforcement policy and its impact on the heroin market. Addiction, 92(5).
White House Office of National Drug Control Policy 1998 The National Drug Control Strategy: 1998. Washington, DC: U.S. Government Printing Office.
White, M.D., and W.A. Luksetich 1983 Heroin: Price elasticity and enforcement strategies. Economic Inquiry XXI (October):557-564.
Zimmer, L., and J. Morgan 1997 Marijuana Myths, Marijuana Facts. New York, NY: The Lindesmith Center.