Clarke, P. D., & Duggan, A. (2012). Pope Alexander III (1159 - 81): The art of survival. Ashgate.
芝加哥风格引文Clarke, Peter D., 与 Anne Duggan. Pope Alexander III (1159 - 81): The Art of Survival. Farnham, Surrey Burlington, VT: Ashgate, 2012.
MLA引文Clarke, Peter D., 与 Anne Duggan. Pope Alexander III (1159 - 81): The Art of Survival. Ashgate, 2012.
警告：这些引文格式不一定是100％准确.