Petri Diaconi : ortus et vita iustorum Cenobii Casinensis /
Petrus,Diaconus, of Monte Cassino,approximately 1107-approximately 1140.
Rodgers, Robert H.(Robert Howard),1944-
Berkeley ; London : University of California Press
1972
A revision of the editor's thesis, Harvard, 1970.
Includes bibliographies.
Montecassino (Monastery)