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Duggan 2008, p. 366. Duggan, Anne J. (2008). "Conciliar Law 1123–1215: The Legislation of the Four Lateran Councils". In Hartmann, Wilfried; Pennington, Kenneth (eds.). The History of Canon Law in the Classical Period, 1140–1234: From Gratian to the Decretals of Pope Gregory IX. The Catholic University of America Press. pp. 318–66. doi:10.2307/j.ctt2853s5.14. ISBN9780813214917. JSTORj.ctt2853s5.14.
Duggan 2008, p. 341. Duggan, Anne J. (2008). "Conciliar Law 1123–1215: The Legislation of the Four Lateran Councils". In Hartmann, Wilfried; Pennington, Kenneth (eds.). The History of Canon Law in the Classical Period, 1140–1234: From Gratian to the Decretals of Pope Gregory IX. The Catholic University of America Press. pp. 318–66. doi:10.2307/j.ctt2853s5.14. ISBN9780813214917. JSTORj.ctt2853s5.14.
Duggan 2008, p. 345. Duggan, Anne J. (2008). "Conciliar Law 1123–1215: The Legislation of the Four Lateran Councils". In Hartmann, Wilfried; Pennington, Kenneth (eds.). The History of Canon Law in the Classical Period, 1140–1234: From Gratian to the Decretals of Pope Gregory IX. The Catholic University of America Press. pp. 318–66. doi:10.2307/j.ctt2853s5.14. ISBN9780813214917. JSTORj.ctt2853s5.14.
Duggan 2008, p. 346. Duggan, Anne J. (2008). "Conciliar Law 1123–1215: The Legislation of the Four Lateran Councils". In Hartmann, Wilfried; Pennington, Kenneth (eds.). The History of Canon Law in the Classical Period, 1140–1234: From Gratian to the Decretals of Pope Gregory IX. The Catholic University of America Press. pp. 318–66. doi:10.2307/j.ctt2853s5.14. ISBN9780813214917. JSTORj.ctt2853s5.14.