Williams, R. L., & Williams, H. A. (2020). Vintage Marketing Differentiation. 1st ed. 2017. Palgrave Macmillan US.
Čikaški stil citiranjaWilliams, Robert L., i Helena A. Williams. Vintage Marketing Differentiation. 1st Ed. 2017. Palgrave Macmillan US, 2020.
MLA način citiranjaWilliams, Robert L., i Helena A. Williams. Vintage Marketing Differentiation. 1st Ed. 2017. Palgrave Macmillan US, 2020.
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