FELKER, C. (1965). Shop mathematics. The Bruce Pub. Co.
Lua i Stíl Chicago (17ú heag.)FELKER, C.A. Shop Mathematics. Milwauke: The Bruce Pub. Co, 1965.
Lua MLA (9ú heag.)FELKER, C.A. Shop Mathematics. The Bruce Pub. Co, 1965.
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