O'Callaghan, J. F. (1993). The learned king: The reign of Alfonso X of Castile. University of Pennsylvania Press.
芝加哥风格引文O'Callaghan, Joseph F. The Learned King: The Reign of Alfonso X of Castile. Philadelphia: University of Pennsylvania Press, 1993.
MLA引文O'Callaghan, Joseph F. The Learned King: The Reign of Alfonso X of Castile. University of Pennsylvania Press, 1993.
警告：这些引文格式不一定是100％准确.