LEWIS, G. H. (1993). Direct Marketing Strategies And Lacties. Golden Books Centre.
Chicago Style (17. basım) AtıfLEWIS, Gordon Herschell. Direct Marketing Strategies And Lacties. Golden Books Centre, 1993.
MLA (8th ed.) AtıfLEWIS, Gordon Herschell. Direct Marketing Strategies And Lacties. Golden Books Centre, 1993.
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