Larson. Gratian's Tractatus de penitentia. The Catholic University of America Press.
芝加哥风格引文Larson. Gratian's Tractatus De Penitentia. The Catholic University of America Press.
MLA引文Larson. Gratian's Tractatus De Penitentia. The Catholic University of America Press.
警告：这些引文格式不一定是100％准确.