QUELCH, J. A. (1989). Sales Promotion Management. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)QUELCH, John A. Sales Promotion Management. Prentice-Hall, 1989.
Lua MLA (8ú heag.)QUELCH, John A. Sales Promotion Management. Prentice-Hall, 1989.
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