Helms, R. B. (1981). Drugs and health: Economic issues and policy objectives. American Enterprise Institute for Public Policy Research.
Čikaški stil citiranja (17. izdanje)Helms, Robert B. Drugs and Health: Economic Issues and Policy Objectives. Washington,D. C: American Enterprise Institute for Public Policy Research, 1981.
MLA način citiranja (9. izdanje)Helms, Robert B. Drugs and Health: Economic Issues and Policy Objectives. American Enterprise Institute for Public Policy Research, 1981.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.