| 1921 | KIT1.1#1 | Kitanov, Severin Valentinov | Beatific Enjoyment in Medieval Scholastic Debates. The Complex Legacy of Saint Augustine and Peter Lombard | da |
| 1922 | KIT1.1#2 | Kitanov, Severin Valentinov | Beatific Enjoyment in Medieval Scholastic Debates. The Complex Legacy of Saint Augustine and Peter Lombard | da |
| 1923 | KLE1 | Klein, Jacob | A Commentary on Plato's Meno | nu |
| 1924 | KLI1.1 | Klibansky, Raymond | The continuity of the Platonic Tradition during the Middle Ages | da |
| 1925 | KLI2.1 | Klingner, F. | Boethii De consolatione Philosophiae | da |
| 1926 | KNO1.1 | Knoll, Paul W. | "A pearl of powerful learning": the university of Cracow in the fifteenth century | nu |
| 1927 | KNO2.1 | Knowles, David | The Evolution of Medieval Thought | da |
| 1928 | KOG1.1 | Kogel, Julius | Petrus Lombardus in seiner Stellung zur Philosophie des Mittelalters | da |
| 1929 | KOL1.1 | Koller, Alexander (herausg.) | Kurie und Politik. Stand und Perspektiven der Nuntiaturberichtsforschung | da |
| 1930 | KON1.1 | König-Pralong, Catherine | Le bon usage des savoirs | da |
