HAYES RICK STEPHEN. (1985). MARKETING FOR YOUR GROWING BUSINESS. JOHN WILEY AND SONS.
Lua i Stíl Chicago (17ú heag.)HAYES RICK STEPHEN. MARKETING FOR YOUR GROWING BUSINESS. NEW YORK: JOHN WILEY AND SONS, 1985.
Lua MLA (9ú heag.)HAYES RICK STEPHEN. MARKETING FOR YOUR GROWING BUSINESS. JOHN WILEY AND SONS, 1985.
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