Sedano, J. 2012. Christof Rolker, Canon Law and the Letters of Ivo of Chartres (Cambridge Studies in Medieval Life and Thought), Cambridge University Press, Cambridge-New York 2010, XIII + 386 pp. Anuario de Historia de la Iglesia. 21, (may 2012), 574. DOI:https://doi.org/10.15581/007.21.2357.