WILLIS, T. H. (1983). Workbook Study Guide To Accompany Statistics For Business And Economics T. Hillman Willis. Business Publications.
Čikaški stil citiranja (17. izdanje)WILLIS, T. Hillman. Workbook Study Guide To Accompany Statistics For Business And Economics T. Hillman Willis. Business Publications, 1983.
MLA način citiranja (8. izdanje)WILLIS, T. Hillman. Workbook Study Guide To Accompany Statistics For Business And Economics T. Hillman Willis. Business Publications, 1983.
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