Clemson, D., & Clemson, W. (1994). Mathematics in the early years. Routledge.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रClemson, David, और Wendy Clemson. Mathematics in the Early Years. London: Routledge, 1994.
एमएलए (9वां संस्करण) प्रशस्ति पत्रClemson, David, और Wendy Clemson. Mathematics in the Early Years. Routledge, 1994.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.