Pennington, K., Mu˜ller, W. P., & Sommar, M. E. (2006). Medieval church law and the origins of the Western legal tradition: A tribute to Kenneth Pennington. Catholic University of America Press.

Pennington, Kenneth, Wolfgang P. Mu˜ller, and Mary E. Sommar. Medieval Church Law and the Origins of the Western Legal Tradition: A Tribute to Kenneth Pennington. Washington, D.C.: Catholic University of America Press, 2006.

Pennington, Kenneth, et al. Medieval Church Law and the Origins of the Western Legal Tradition: A Tribute to Kenneth Pennington. Catholic University of America Press, 2006.