Keller, T. J. (1958). Religious law in the decretals of Gregory IX: A general survey.
Čikaški stil citiranja (17. izdanje)Keller, Thomas J. Religious Law in the Decretals of Gregory IX: A General Survey. 1958.
MLA način citiranja (8. izdanje)Keller, Thomas J. Religious Law in the Decretals of Gregory IX: A General Survey. 1958.
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