APA (7th ed.) Citation

Butler, R. W., Hayhurst, K. J., & Johnson, S. C. (1998). A note about HARP's state trimming method. National Aeronautics and Space Administration, Langley Research Center.

Chicago Style (17th ed.) Citation

Butler, Ricky W., Kelly J. Hayhurst, and Sally C. Johnson. A Note About HARP's State Trimming Method. Hampton, Virginia: National Aeronautics and Space Administration, Langley Research Center, 1998.

MLA (9th ed.) Citation

Butler, Ricky W., et al. A Note About HARP's State Trimming Method. National Aeronautics and Space Administration, Langley Research Center, 1998.