WILLBORN, W. (1994). Global Management Of Quality Assurance Systems Walter Willborn, T.c. Edwin Cheng. McGraw-Hill.
Chicago-viite (17. p.)WILLBORN, Walter. Global Management Of Quality Assurance Systems Walter Willborn, T.c. Edwin Cheng. McGraw-Hill, 1994.
MLA-viite (8. p.)WILLBORN, Walter. Global Management Of Quality Assurance Systems Walter Willborn, T.c. Edwin Cheng. McGraw-Hill, 1994.
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