Tillmann, H. (1980). Pope Innocent III. North-Holland ; distributed by Elsevier North-Holland.
Citazione stile Chigago Style (17a edizione)Tillmann, Helene. Pope Innocent III. Amsterdam ; New York : New York, N.Y.: North-Holland ; distributed by Elsevier North-Holland, 1980.
Citatione MLA (8a ed.)Tillmann, Helene. Pope Innocent III. North-Holland ; distributed by Elsevier North-Holland, 1980.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.