WILLBORN, W. (1994). Global Management Of Quality Assurance Systems Walter Willborn, T.c. Edwin Cheng. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)WILLBORN, Walter. Global Management Of Quality Assurance Systems Walter Willborn, T.c. Edwin Cheng. McGraw-Hill, 1994.
Lua MLA (8ú heag.)WILLBORN, Walter. Global Management Of Quality Assurance Systems Walter Willborn, T.c. Edwin Cheng. McGraw-Hill, 1994.
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