Anders Winroth: Where Gratian Slept: The Life and Death of the Father of Canon Law. In: Zeitschrift der Savigny-Stiftung für Rechtsgeschichte: Kanonistische Abteilung. Band99, Nr.1, 2013, ISSN2304-4896, S.105–128, doi:10.7767/zrgka.2013.99.1.105.
John T. Noonan: Gratian Slept Here: The Changing Identity of the Father of the Systematic Study of Canon Law. In: Traditio. Band35, 1979, ISSN0362-1529, S.145–172, doi:10.1017/S0362152900015038.
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Anders Winroth: Where Gratian Slept: The Life and Death of the Father of Canon Law. In: Zeitschrift der Savigny-Stiftung für Rechtsgeschichte: Kanonistische Abteilung. Band99, Nr.1, 2013, ISSN2304-4896, S.105–128, doi:10.7767/zrgka.2013.99.1.105.
John T. Noonan: Gratian Slept Here: The Changing Identity of the Father of the Systematic Study of Canon Law. In: Traditio. Band35, 1979, ISSN0362-1529, S.145–172, doi:10.1017/S0362152900015038.