Não informado. (1948). Columbia Engineering Quarterly. Columbia University, Faculty of Engineering, School of Engineering.
Lua i Stíl Chicago (17ú heag.)Não informado. Columbia Engineering Quarterly. New York: Columbia University, Faculty of Engineering, School of Engineering, 1948.
Lua MLA (8ú heag.)Não informado. Columbia Engineering Quarterly. Columbia University, Faculty of Engineering, School of Engineering, 1948.
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