Gull, Cloyd Dake, Smith, Charles Louis, Wooldridge, E. T., and Collins, Martin J., editors. 1989. Directory of Sources for Air and Space History: Primary Historical Collections in U.S. Repositories. Washington, D.C.: National Air and Space Museum, Smithsonian Institution.
A directory of sources for air and space history: primary historical collections in United States repositories / Cloyd Dake Gull and Charles Louis Smith, [compilers and] research editors ; E.T. Wooldridge, original compiler ; Martin J. Collins, general editor