Não informado. (1961). Advertising and Sales Promotion. Crain Communications.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Advertising and Sales Promotion. Chicago, Ill: Crain Communications, 1961.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Advertising and Sales Promotion. Crain Communications, 1961.
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