Galloway, A. (2006). The Penn commentary on Piers Plowman. University of Pennsylvania Press.
芝加哥风格引文Galloway, Andrew. The Penn Commentary on Piers Plowman. Philadelphia, Pa.: University of Pennsylvania Press, 2006.
MLA引文Galloway, Andrew. The Penn Commentary on Piers Plowman. University of Pennsylvania Press, 2006.
警告：这些引文格式不一定是100％准确.