Spurr, W. A. (1961). Business and economic statistics (Rev, [i.e. 2d].). Irwin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSpurr, William Alfred. Business and Economic Statistics. Rev, [i.e. 2d]. Homewood, Illinois: Irwin, 1961.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSpurr, William Alfred. Business and Economic Statistics. Rev, [i.e. 2d]. Irwin, 1961.
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