Rosenberg, R. R. (1968). Business math 30: A 30-unit text-workbook for office occupations. McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRosenberg, Reuben Robert. Business Math 30: A 30-unit Text-workbook for Office Occupations. New York: McGraw-Hill, 1968.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRosenberg, Reuben Robert. Business Math 30: A 30-unit Text-workbook for Office Occupations. McGraw-Hill, 1968.
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