Roenneberg, T. (2012). Internal time: Chronotypes, social jet lag, and why you're so tired. Harvard University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRoenneberg, Till. Internal Time: Chronotypes, Social Jet Lag, and Why You're so Tired. Cambridge, Mass: Harvard University Press, 2012.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRoenneberg, Till. Internal Time: Chronotypes, Social Jet Lag, and Why You're so Tired. Harvard University Press, 2012.
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