Christian political theory and church politics in the mid-twelfth century; the ecclesiology of Gratian's Decretum.
- Berkeley, University of California Press, 1972.
- Publications of the Center for Medieval and Renaissance Studies, U.C.L.A., 5 .
- Publications of the Center for Medieval and Renaissance Studies ; 5. .
Published under the auspices of the Center for Medieval and Renaissance Studies, University of California, Los Angeles.