Hall, E. J., Delaney, R. A., & Bettner, J. L. (1990). Investigation of advanced counterrotation blade configuration concepts for high speed turboprop systems: Final report. National Aeronautics and Space Administration.
Chicago Style (17th ed.) CitationHall, Edward J., Robert A. Delaney, and James L. Bettner. Investigation of Advanced Counterrotation Blade Configuration Concepts for High Speed Turboprop Systems: Final Report. [Washington, D.C.]: National Aeronautics and Space Administration, 1990.
MLA (9th ed.) CitationHall, Edward J., et al. Investigation of Advanced Counterrotation Blade Configuration Concepts for High Speed Turboprop Systems: Final Report. National Aeronautics and Space Administration, 1990.
Warning: These citations may not always be 100% accurate.