Roenneberg, T. (2012). Internal time: Chronotypes, social jet lag, and why you're so tired. Harvard University Press.
Chicago-referens (17:e uppl.)Roenneberg, Till. Internal Time: Chronotypes, Social Jet Lag, and Why You're so Tired. Cambridge, Mass: Harvard University Press, 2012.
MLA-referens (9:e uppl.)Roenneberg, Till. Internal Time: Chronotypes, Social Jet Lag, and Why You're so Tired. Harvard University Press, 2012.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.