APA (7th ed.) Citation

Langley Research Center, United States. Army Aviation Research and Technology Activity, & Brooks, T. F. (1989). Reduction of blade-vortex interaction noise using higher harmonic pitch control. National Aeronautics and Space Administration, Langley Research Center.

Chicago Style (17th ed.) Citation

Langley Research Center, United States. Army Aviation Research and Technology Activity, and Thomas F. Brooks. Reduction of Blade-vortex Interaction Noise Using Higher Harmonic Pitch Control. Hampton, Va. : US Army Aviation Systems Command, Aviation R & T Activity: National Aeronautics and Space Administration, Langley Research Center, 1989.

MLA (9th ed.) Citation

Langley Research Center, et al. Reduction of Blade-vortex Interaction Noise Using Higher Harmonic Pitch Control. National Aeronautics and Space Administration, Langley Research Center, 1989.