| 1901 | KLE1 | Klein, Jacob | A Commentary on Plato's Meno | nu |
| 1902 | KLI1.1 | Klibansky, Raymond | The continuity of the Platonic Tradition during the Middle Ages | da |
| 1903 | KLI2.1 | Klingner, F. | Boethii De consolatione Philosophiae | da |
| 1904 | KNO1.1 | Knoll, Paul W. | "A pearl of powerful learning": the university of Cracow in the fifteenth century | nu |
| 1905 | KNO2.1 | Knowles, David | The Evolution of Medieval Thought | da |
| 1906 | KOG1.1 | Kogel, Julius | Petrus Lombardus in seiner Stellung zur Philosophie des Mittelalters | da |
| 1907 | KOL1.1 | Koller, Alexander (herausg.) | Kurie und Politik. Stand und Perspektiven der Nuntiaturberichtsforschung | da |
| 1908 | KON1.1 | König-Pralong, Catherine | Le bon usage des savoirs | da |
| 1909 | KON1.2 | Konig-Pralong, Katherine | Avenement de l'aristotelisme en terre chretienne | da |
| 1910 | KON1.3 | König-Pralong, Catherine | Etre, Essence & Contingence. Henri de Gand, Gilles de Rome, Godefroid de Fontaines | da |
| 1911 | KON1.4 | König-Pralong, Catherine | Médiévisme philosophique et raison moderne. De Pierre Bayle à Ernest Renan | da |
| 1912 | KOO1.1 | Kooper, Erik; Levelt, Sjoerd | The Medieval Chronicle IX | da |
| 1913 | KOT1.1 | Kotkas, Toomas | Royal Police Ordinances In Early Modern Sweden The Emergence Of Voluntaristic Understanding Of Law | da |
| 1914 | KOW1.1 | Kowalczyk, Maria | Krakowskie mowy uniwersyteckie z pierwszej polowy XV wieku | da |
| 1915 | KRA1.1 | Kraut, Richard | The Cambridge companion to Plato | da |
| 1916 | KRA2.1 | Kraemer, Joel L. | Humanism in the renaissance of Islam: the cultural revival during the Buyid age | da |
| 1917 | KRE1.1 | Kremer, Klaus | Die Neoplatonische Seinsphilosophie und ihre Wirkung auf Thomas von Aquin | da |
| 1918 | KRE2.1 | Kretzmann, N.; Kenny, A.; Pinborg, A. | The Cambridge Companion to Later Medieval Philosophy | da |
| 1919 | KRI1.1 | Kristeller, Paul Oskar | Latin Manuscript Books before 1600 | da |
| 1920 | KRI1.2.1 | Kristeller, Paul Oskar (ed.) | Catalogus translationum et commentariorum: Medieval and Renaissance Latin Translations and Commentaries | da |
| 1921 | KRI1.3 | Kristeller, Paul Oskar | Renaissance thought and its sources | nu |
| 1922 | KRU1.1 | Krüger, Max | Griechisches Ubungsbuch | da |
| 1923 | KRU2.1 | Kruger, Gerhart | Ragione e Passione, L'essenza del pensiero platonico | da |
| 1924 | KUH1.1 | Kühn, Wilfried | Quel savoir après le scepticisme? | da |
| 1925 | KÜN1.1 | Küng, Hans | Dans Christentum.Wesen und Geschichte | da |
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