Cita APA (7th ed.)
Watkinson, J. (2004). Art of the helicopter. Elsevier Butterworth-Heinemann.
Cita Chicago (17th ed.)
Watkinson, John. Art of the Helicopter. Oxford ; Burlington, MA: Elsevier Butterworth-Heinemann, 2004.
Cita MLA (9th ed.)
Watkinson, John. Art of the Helicopter. Elsevier Butterworth-Heinemann, 2004.
Atenció: Aquestes cites poden no estar 100% correctes.