Robert, o. F., & Firth, J. J. F. (1971). Liber poenitentialis: A critical edition with introduction and notes. Pontifical Institute of Mediaeval Studies.
MLA CitationRobert, of Flamborough, and J. J. Francis Firth. Liber Poenitentialis: A Critical Edition with Introduction and Notes. Pontifical Institute of Mediaeval Studies, 1971.
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