Salvendy, G., & Karwowski, W. Introduction to Service Engineering. Wiley.
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Chicago-čujuhus (17. p.)
Salvendy, Gavriel, juo Waldemar Karwowski. Introduction to Service Engineering. Hoboken, EUA: Wiley.
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MLA-čujuhus (9. p.)
Salvendy, Gavriel, juo Waldemar Karwowski. Introduction to Service Engineering. Wiley.
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