Helms, R. B. (1980). The international supply of medicines. Washington, D. C: American Enterprise Institute for Public Policy research.
استشهاد بنمط شيكاغوHelms, Robert B. The International Supply of Medicines. Washington, D. C: American Enterprise Institute for Public Policy research, 1980.
MLA استشهادHelms, Robert B. The International Supply of Medicines. Washington, D. C: American Enterprise Institute for Public Policy research, 1980.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.