Cita APA (7th ed.)
Watkinson , J. (2004). The art of the helicopter. Elsevier.
Cita Chicago (17th ed.)
Watkinson , John. The Art of the Helicopter. New York: Elsevier, 2004.
Cita MLA (9th ed.)
Watkinson , John. The Art of the Helicopter. Elsevier, 2004.
Atenció: Aquestes cites poden no estar 100% correctes.