Não informado. (1969). Machine shop and metalworking economics. Engineering, Chemical & Machine Press.
Lua i Stíl Chicago (17ú heag.)Não informado. Machine Shop and Metalworking Economics. London: Engineering, Chemical & Machine Press, 1969.
Lua MLA (8ú heag.)Não informado. Machine Shop and Metalworking Economics. Engineering, Chemical & Machine Press, 1969.
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