Smith. (1998). Mechanical engineer's reference book (12th ed.). Butterworth Heinemann.
Lua i Stíl Chicago (17ú heag.)Smith. Mechanical Engineer's Reference Book. 12th ed. Oxford: Butterworth Heinemann, 1998.
Lua MLA (8ú heag.)Smith. Mechanical Engineer's Reference Book. 12th ed. Butterworth Heinemann, 1998.
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