MCCALL J B. (1984). MARKETING BY AGREEMENT. JOHN WILEY AND SONS.
Lua i Stíl Chicago (17ú heag.)MCCALL J B. MARKETING BY AGREEMENT. NEW YORK: JOHN WILEY AND SONS, 1984.
Lua MLA (9ú heag.)MCCALL J B. MARKETING BY AGREEMENT. JOHN WILEY AND SONS, 1984.
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