| 1921 | KOW1.1 | Kowalczyk, Maria | Krakowskie mowy uniwersyteckie z pierwszej polowy XV wieku | da |
| 1922 | KRA1.1 | Kraut, Richard | The Cambridge companion to Plato | da |
| 1923 | KRA2.1 | Kraemer, Joel L. | Humanism in the renaissance of Islam: the cultural revival during the Buyid age | da |
| 1924 | KRE1.1 | Kremer, Klaus | Die Neoplatonische Seinsphilosophie und ihre Wirkung auf Thomas von Aquin | da |
| 1925 | KRE2.1 | Kretzmann, N.; Kenny, A.; Pinborg, A. | The Cambridge Companion to Later Medieval Philosophy | da |
| 1926 | KRI1.1 | Kristeller, Paul Oskar | Latin Manuscript Books before 1600 | da |
| 1927 | KRI1.2.1 | Kristeller, Paul Oskar (ed.) | Catalogus translationum et commentariorum: Medieval and Renaissance Latin Translations and Commentaries | da |
| 1928 | KRI1.3 | Kristeller, Paul Oskar | Renaissance thought and its sources | nu |
| 1929 | KRU1.1 | Krüger, Max | Griechisches Ubungsbuch | da |
| 1930 | KRU2.1 | Kruger, Gerhart | Ragione e Passione, L'essenza del pensiero platonico | da |
| 1931 | KUH1.1 | Kühn, Wilfried | Quel savoir après le scepticisme? | da |
| 1932 | KÜN1.1 | Küng, Hans | Dans Christentum.Wesen und Geschichte | da |
| 1933 | KÜN1.2 | Küng, Hans | Erkämpfte Freiheit | da |
| 1934 | KÜN1.3 | Küng, Hans | Die Kirche | da |
| 1935 | KUN2.1 | Kunitzsch, Paul | The Arabs and the stars: texts and traditions on the fixed stars, and their influence in medieval Europe | da |
| 1936 | KUR1.1.1 | Kurfess, A. (ed.) | Appendix Sallustiana I | da |
| 1937 | KUR1.1.2 | Kurfess, A. (ed.) | Appendix Sallustiana II | da |
| 1938 | KUR2.1 | Kurdziałek, Marian | Prolegomena zu Davidis de Dinanto Quaternulorum fragmenta | da |
| 1939 | LAB1.1 | Labarbe, Jules | L`Homere de Platon | da |
| 1940 | LAC1.1 | Lacrosse, Joachim | La philosophie de Plotin. Intellect et discursivite | nu |
| 1941 | LAC2.1 | Lactantius | Von den Todesarten der Verfolger et al. | da |
| 1942 | LAF1.1 | Lafleur, Claude | Quatre introductions à la philosophie au XIIIe siècle | da |
| 1943 | LAG1.1.1 | Lagerlund, Henrik (ed.) | Encyclopedia of Medieval Philosophy. Philosophy Between 500 and 1500. Vol. 1 A-L | da |
| 1944 | LAG1.1.2 | Lagerlund, Henrik (ed.) | Encyclopedia of Medieval Philosophy. Philosophy Between 500 and 1500. Vol. 2 M-Z | da |
| 1945 | LAK1.1 | Laks, Andre | Diogene d'Apollonie | da |
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