Hirsch, R., & Trento, J. J. (1973). The National Aeronautics and Space Administration. Praeger.
Lua i Stíl Chicago (17ú heag.)Hirsch, Richard, agus Joseph John Trento. The National Aeronautics and Space Administration. New York: Praeger, 1973.
Lua MLA (8ú heag.)Hirsch, Richard, agus Joseph John Trento. The National Aeronautics and Space Administration. Praeger, 1973.
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