APA-referens (7:e uppl.)
Booker, C. M. (2009). Past convictions: The penance of Louis the Pious and the decline of the Carolingians. University of Pennsylvania Press.
Chicago-referens (17:e uppl.)
Booker, Courtney M. Past Convictions: The Penance of Louis the Pious and the Decline of the Carolingians. Philadelphia: University of Pennsylvania Press, 2009.
MLA-referens (9:e uppl.)
Booker, Courtney M. Past Convictions: The Penance of Louis the Pious and the Decline of the Carolingians. University of Pennsylvania Press, 2009.
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