Trimble, W. F. (1982). High frontier: A history of aeronautics in Pennsylvania. Pittsburgh, Pa: University of Pittsburgh Press.
Chicago Style CitationTrimble, William F. High Frontier: A History of Aeronautics in Pennsylvania. Pittsburgh, Pa: University of Pittsburgh Press, 1982.
Cita MLATrimble, William F. High Frontier: A History of Aeronautics in Pennsylvania. Pittsburgh, Pa: University of Pittsburgh Press, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.