Não informado. (1952). Bulletin of Mechanical Engineering Education. Wynn Williams Publishers.
Lua i Stíl Chicago (17ú heag.)Não informado. Bulletin of Mechanical Engineering Education. Wreyham, Inglaterra: Wynn Williams Publishers, 1952.
Lua MLA (8ú heag.)Não informado. Bulletin of Mechanical Engineering Education. Wynn Williams Publishers, 1952.
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