Edwards, C. W. (1963). A test of arithmetic principles, elementary form. University Microfilms.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEdwards, Charles Walter. A Test of Arithmetic Principles, Elementary Form. [Ann Arbor, Mich: University Microfilms, 1963.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEdwards, Charles Walter. A Test of Arithmetic Principles, Elementary Form. University Microfilms, 1963.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.