Noise characteristics of eight helicopters :
final report : prepared for U.S. Dept. of Transportation, Federal Aviation Administration, Systems Research and Development Service /
[Harold C. True and E. J. Rickley].

APA Citation

True, H. C., United States. Federal Aviation Administration. Systems Research and Development Service. (1977). Noise characteristics of eight helicopters: final report : prepared for U.S. Dept. of Transportation, Federal Aviation Administration, Systems Research and Development Service. Washington: Dept. of Transportation, Federal Aviation Administration, Systems Research & Development Service .

MLA Citation

True, Harold C, and United States. Federal Aviation Administration. Systems Research and Development Service. Noise Characteristics of Eight Helicopters: Final Report : Prepared for U.S. Dept. of Transportation, Federal Aviation Administration, Systems Research And Development Service. Washington: Dept. of Transportation, Federal Aviation Administration, Systems Research & Development Service , 1977.

Warning: These citations may not always be complete (especially for serials).