| 1921 | KRA2.1 | Kraemer, Joel L. | Humanism in the renaissance of Islam: the cultural revival during the Buyid age | da |
| 1922 | KRE1.1 | Kremer, Klaus | Die Neoplatonische Seinsphilosophie und ihre Wirkung auf Thomas von Aquin | da |
| 1923 | KRE2.1 | Kretzmann, N.; Kenny, A.; Pinborg, A. | The Cambridge Companion to Later Medieval Philosophy | da |
| 1924 | KRI1.1 | Kristeller, Paul Oskar | Latin Manuscript Books before 1600 | da |
| 1925 | KRI1.2.1 | Kristeller, Paul Oskar (ed.) | Catalogus translationum et commentariorum: Medieval and Renaissance Latin Translations and Commentaries | da |
| 1926 | KRI1.3 | Kristeller, Paul Oskar | Renaissance thought and its sources | nu |
| 1927 | KRU1.1 | Krüger, Max | Griechisches Ubungsbuch | da |
| 1928 | KRU2.1 | Kruger, Gerhart | Ragione e Passione, L'essenza del pensiero platonico | da |
| 1929 | KUH1.1 | Kühn, Wilfried | Quel savoir après le scepticisme? | da |
| 1930 | KÜN1.1 | Küng, Hans | Dans Christentum.Wesen und Geschichte | da |
