- BIELER L., The Irish Penitentials, Dublin 1963, 97-107.
- MCNEILL J.T. - GAMER H.M., Medieval handbooks of penance: a translation of the principal “libri poenitentiales” and selections from related documents, New York 1938, 250-257.
- WALKER G.S.M., Sancti Columbani Opera, Dublin 1957, 169-181.