The history of courts and procedure in medieval Canon law / edited by Wilfried Hartmann and Kenneth Pennington. - Washington, DC, 2016. ed.

The history of medieval canon law in the classical period, 1140-1234 / edited by Wilfried Hartmann and Kenneth Pennington. - Washington (DC), ©2008. ed.

Liber contra Wolfelmum / Manegold von Lautenbach. - Weimar, 1972. ed.

Die Synoden der Karolingerzeit im Frankenreich und in Italien / Wilfried Hartmann. - Paderborn [etc.], 1989.

Max Scheler / hrsg. von Wilfried Hartmann. - Stuttgart-Bad Cannstat, 1963. ed.

The History of Byzantine and Eastern Canon Law to 1500 / edited by Wilfried Hartmann and Kenneth Pennington. - Washington (D.C.), 2012. ed.