Problems of specialised helicopter operations :
[papers] presented at the Royal Aeronautical Society, 9 February 1977.
APA Citation
Royal Aeronautical Society. (1977). Problems of specialised helicopter operations: [papers] presented at the Royal Aeronautical Society, 9 February 1977. London: Royal Aeronautical Society.
MLA Citation
Royal Aeronautical Society. Problems of Specialised Helicopter Operations: [papers] Presented At the Royal Aeronautical Society, 9 February 1977. London: Royal Aeronautical Society, 1977.
Warning: These citations may not always be complete (especially for serials).