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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Aspen Emphysema Conference و 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.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Aspen Emphysema Conference و 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.