APA

Jasper D., Fuhrmann H., . (2001). Papal letters in the Early Middle Ages. Washington, D.C: Catholic University of America Press.

Chicago

Jasper Detlev, Fuhrmann Horst, . 2001. Papal letters in the Early Middle Ages. Washington, D.C: Catholic University of America Press.

Harvard

Jasper D., Fuhrmann H., . (2001). Papal letters in the Early Middle Ages. Washington, D.C: Catholic University of America Press.

MLA

Jasper Detlev, Fuhrmann Horst, . Papal letters in the Early Middle Ages. Washington, D.C: Catholic University of America Press. 2001.