RYAN, W. T. (1980). Personal Learning Aid For Principles Of Marketing William T Ryan. Dow Jones Irwin.
Čikaški stil citiranja (17. izdanje)RYAN, William T. Personal Learning Aid For Principles Of Marketing William T Ryan. Dow Jones Irwin, 1980.
MLA način citiranja (8. izdanje)RYAN, William T. Personal Learning Aid For Principles Of Marketing William T Ryan. Dow Jones Irwin, 1980.
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