Helms, R. B. (1980). The international supply of medicines. Washington, D. C: American Enterprise Institute for Public Policy research.
Παραπομπή Chicago StyleHelms, Robert B. The International Supply of Medicines. Washington, D. C: American Enterprise Institute for Public Policy research, 1980.
Παραπομπή MLAHelms, Robert B. The International Supply of Medicines. Washington, D. C: American Enterprise Institute for Public Policy research, 1980.
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