Ferrel, O. (2014). Marketing Strategy Text and cases (6th edition). Cengage Lerning.
Čikaški stil citiranja (17. izdanje)Ferrel, O.C. Marketing Strategy Text and Cases (6th Edition). Cengage Lerning, 2014.
MLA način citiranja (8. izdanje)Ferrel, O.C. Marketing Strategy Text and Cases (6th Edition). Cengage Lerning, 2014.
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