Хеликоптер — разлика између измена

м (harvardski nacin citiranja)
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* Frawley, Gerard. ''The International Directory of Civil Aircraft, 2003–2004''. Fyshwick, Canberra, Act, Australia: Aerospace Publications Pty Ltd., p. 155. {{page|year=2003|isbn=978-1-875671-58-8|pages=}}.