Watkinson, J. (2004). Art of the helicopter. Elsevier Butterworth-Heinemann.
Chicago-čujuhus (17. p.)Watkinson, John. Art of the Helicopter. Oxford ; Burlington, MA: Elsevier Butterworth-Heinemann, 2004.
MLA-čujuhus (9. p.)Watkinson, John. Art of the Helicopter. Elsevier Butterworth-Heinemann, 2004.
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