Butts, A. (1943). Metallurgical problems (2nd ed.). New York ; London: McGraw-Hill book company, inc..
Παραπομπή Chicago StyleButts, Allison. Metallurgical Problems. 2nd ed. New York ; London: McGraw-Hill book company, inc., 1943.
Παραπομπή MLAButts, Allison. Metallurgical Problems. 2nd ed. New York ; London: McGraw-Hill book company, inc., 1943.
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