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.
芝加哥风格引文Aspen Emphysema Conference 与 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.
MLA引文Aspen Emphysema Conference 与 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.