Cita APA (7th ed.)
Oravas, G. A. (1969). Classics in the history of engineering. Johnson Repr.Corpor.
Cita Chicago (17th ed.)
Oravas, Gunhard Aestius. Classics in the History of Engineering. New York, London: Johnson Repr.Corpor, 1969.
Cita MLA (9th ed.)
Oravas, Gunhard Aestius. Classics in the History of Engineering. Johnson Repr.Corpor, 1969.
Atenció: Aquestes cites poden no estar 100% correctes.