Booker, C. M. (2009). Past convictions: The penance of Louis the Pious and the decline of the Carolingians. University of Pennsylvania Press.
芝加哥风格引文Booker, Courtney M. Past Convictions: The Penance of Louis the Pious and the Decline of the Carolingians. Philadelphia: University of Pennsylvania Press, 2009.
MLA引文Booker, Courtney M. Past Convictions: The Penance of Louis the Pious and the Decline of the Carolingians. University of Pennsylvania Press, 2009.
警告：这些引文格式不一定是100％准确.