WILLIS, T. H. (1983). Workbook Study Guide To Accompany Statistics For Business And Economics T. Hillman Willis. Business Publications.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWILLIS, T. Hillman. Workbook Study Guide To Accompany Statistics For Business And Economics T. Hillman Willis. Business Publications, 1983.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWILLIS, T. Hillman. Workbook Study Guide To Accompany Statistics For Business And Economics T. Hillman Willis. Business Publications, 1983.
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