BERRY LEONARD L. (1991). MARKETING SERVICES: COMPETING THROUGH QUALITY. FREE PRESS.
Chicago-čujuhus (17. p.)BERRY LEONARD L. MARKETING SERVICES: COMPETING THROUGH QUALITY. NEW YORK: FREE PRESS, 1991.
MLA-čujuhus (9. p.)BERRY LEONARD L. MARKETING SERVICES: COMPETING THROUGH QUALITY. FREE PRESS, 1991.
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