Watkinson , J. (2004). The art of the helicopter. Elsevier.
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Dyfyniad Arddull Chicago
Watkinson , John. The Art of the Helicopter. New York: Elsevier, 2004.
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Dyfyniad MLA
Watkinson , John. The Art of the Helicopter. Elsevier, 2004.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.