Knowlton, H. (1941). Air transportation in the United States: Its growth as a business. The University of Chicago press.
Chicago Style (17th ed.) CitationKnowlton, Hugh. Air Transportation in the United States: Its Growth as a Business. Chicago, Ill.: The University of Chicago press, 1941.
MLA (9th ed.) CitationKnowlton, Hugh. Air Transportation in the United States: Its Growth as a Business. The University of Chicago press, 1941.
Warning: These citations may not always be 100% accurate.