Kief, H. B. (1992). Computer numerical control. Glencoe.
Lua i Stíl Chicago (17ú heag.)Kief, Hans B. Computer Numerical Control. Lake Forest, Ill: Glencoe, 1992.
Lua MLA (9ú heag.)Kief, Hans B. Computer Numerical Control. Glencoe, 1992.
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