National Council of Teachers of Mathematics. (1972). The slow learner in mathematics. NCTM.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Council of Teachers of Mathematics. The Slow Learner in Mathematics. Washington: NCTM, 1972.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNational Council of Teachers of Mathematics. The Slow Learner in Mathematics. NCTM, 1972.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.