The Bielefeld interdisciplinary project & Immelmann, K. (1981). Behavioral development: The Bielefeld Interdisciplinary project. Cambridge University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रThe Bielefeld interdisciplinary project और Klaus Immelmann. Behavioral Development: The Bielefeld Interdisciplinary Project. New York: Cambridge University Press, 1981.
एमएलए (9वां संस्करण) प्रशस्ति पत्रThe Bielefeld interdisciplinary project और Klaus Immelmann. Behavioral Development: The Bielefeld Interdisciplinary Project. Cambridge University Press, 1981.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.