Somerville, R. (1990, April 15). Papacy, councils, and canon law in the 11th-12th centuries. Variorum collected studies series.
芝加哥风格引文Somerville, Robert. "Papacy, Councils, and Canon Law in the 11th-12th Centuries." Variorum Collected Studies Series 15 Apr. 1990.
MLA引文Somerville, Robert. "Papacy, Councils, and Canon Law in the 11th-12th Centuries." Variorum Collected Studies Series, 15 Apr. 1990.
警告：这些引文格式不一定是100％准确.