Não informado. (1930). Advertising Age: International newspaper of marketing. Crain Communications.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Advertising Age: International Newspaper of Marketing. Chicago, Ill: Crain Communications, 1930.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Advertising Age: International Newspaper of Marketing. Crain Communications, 1930.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.