Aspen Emphysema Conference & Chronic Respiratory Diseases Control Program (U.S.). (1969). Current research in chronic respiratory disease: Proceedings. U.S. Chronic Respiratory Diseases Control Program; [for sale by the Supt. of Docs., U.S. Govt. Print. Off., Washington.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Aspen Emphysema Conference và Chronic Respiratory Diseases Control Program (U.S.). Current Research in Chronic Respiratory Disease: Proceedings. Arlington, Va.: U.S. Chronic Respiratory Diseases Control Program; [for sale by the Supt. of Docs., U.S. Govt. Print. Off., Washington, 1969.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)Aspen Emphysema Conference và Chronic Respiratory Diseases Control Program (U.S.). Current Research in Chronic Respiratory Disease: Proceedings. U.S. Chronic Respiratory Diseases Control Program; [for sale by the Supt. of Docs., U.S. Govt. Print. Off., Washington, 1969.