LEWIS, G. H. (1993). Direct Marketing Strategies And Lacties. Golden Books Centre.
Čikaški stil citiranja (17. izdanje)LEWIS, Gordon Herschell. Direct Marketing Strategies And Lacties. Golden Books Centre, 1993.
MLA način citiranja (8. izdanje)LEWIS, Gordon Herschell. Direct Marketing Strategies And Lacties. Golden Books Centre, 1993.
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