Kumar, A. (1998). Age, teaching model and concept attainment. Manak.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKumar, Arun. Age, Teaching Model and Concept Attainment. Manak, 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKumar, Arun. Age, Teaching Model and Concept Attainment. Manak, 1998.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.