| 2000662 | Klartext fur den ZX81 | - | German |
| 2000575 | Kleincomputer Leichtverstandlich | - | German |
| 2000576 | Kleincomputer-Fibel | - | German |
| 2001304 | Kleiner Basic-Wortschatz | - | German |
| 2001134 | Kleiner Sprachfuhrer BASIC, LOGO, PASCAL | - | German |
| 2000921 | Knobeleien mit dem Mikro | - | German |
| 2001000 | Know Your Spectrum | - | English |
| 2000610 | Kreativ mit dem Computer | - | German |
| 2000750 | Kucni Kompjuteri: Algoritmi i Programi | - | Serbian |
| 2000611 | Kunstliche Intelligenz | - | German |
| 2000732 | L'Assembleur Facile du Z80 | - | French |
| 2000220 | LISP: The Language of Artificial Intelligence | - | English |
| 2001418 | LOGO | - | Portuguese |
| 2001172 | LOGO Programming | - | English |
| 2001208 | LOGO Programming | - | English |
| 2000934 | LOGO for Beginners | - | English |
| 2001313 | LOGO na Sinclair Spectrum volume 2: Dla Zaawansowanych | - | Polish |
| 2000222 | LOGO on the Sinclair Spectrum | - | English |
| 2000612 | LOGO: Grafik, Sprache, Mathematik | - | German |
| 2000827 | La Conduite du ZX81 | - | French |