Jeffrey A., Roy (May–June 1990). "The Stabilized Approach". FAA Aviation News: A DOT/FAA Flight Standards Safety Publication. Flight Standards' Accident Prevention Program Branch, Federal Aviation Administration, Department of Transportation: 4. Retrieved 28 February 2023.
NASA Technical Paper. National Aeronautics and Space Administration, Scientific and Technical Information Office. 1981. p. 6. Retrieved 28 February 2023.