Unger, R. W. (2004). Beer in the Middle Ages and the Renaissance. University of Pennsylvania Press.
芝加哥风格引文Unger, Richard W. Beer in the Middle Ages and the Renaissance. Philadelphia: University of Pennsylvania Press, 2004.
MLA引文Unger, Richard W. Beer in the Middle Ages and the Renaissance. University of Pennsylvania Press, 2004.
警告：这些引文格式不一定是100％准确.