APA ציטוט

Helms, R. B. (1980). The international supply of medicines. Washington, D. C: American Enterprise Institute for Public Policy research.

Trích dẫn kiểu Chicago

Helms, Robert B. The International Supply of Medicines. Washington, D. C: American Enterprise Institute for Public Policy research, 1980.

ציטוט MLA

Helms, Robert B. The International Supply of Medicines. Washington, D. C: American Enterprise Institute for Public Policy research, 1980.