Pontifical Institute of Mediaeval Studies & Ryan, C. (1989). The religious roles of the papacy: Ideals and realities ; 1150-1300. Papers in mediaeval studies.
芝加哥风格引文Pontifical Institute of Mediaeval Studies 与 Christopher Ryan. "The Religious Roles of the Papacy: Ideals and Realities ; 1150-1300." Papers in Mediaeval Studies 1989.
MLA引文Pontifical Institute of Mediaeval Studies 与 Christopher Ryan. "The Religious Roles of the Papacy: Ideals and Realities ; 1150-1300." Papers in Mediaeval Studies, 1989.
警告：这些引文格式不一定是100％准确.