HENDERSON, J. V., POOLE, W., & PARISH, A. E. (1991). Student workbook for principles of economics. D.C. Heath and Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHENDERSON, J. Vernon, William POOLE, और Albert E. PARISH. Student Workbook for Principles of Economics. Lexington: D.C. Heath and Company, 1991.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHENDERSON, J. Vernon, et al. Student Workbook for Principles of Economics. D.C. Heath and Company, 1991.
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