| 2001084 | Computer-Lexikon | - | German |
| 2000795 | Computer-Losungen fur Schule, Studium und Alltag | - | German |
| 2000794 | Computer-Programme fur Sinclair ZX 81 | - | German |
| 2000579 | Computerbegriffe Popular | - | German |
| 2001106 | Computers | - | English |
| 2001267 | Computers For Kids: Sinclair ZX-81 Edition | - | English |
| 2000766 | Computers for Accountants | - | English |
| 2001286 | Computers in Schools | - | English |
| 2000606 | Computerwissen fur Alle | - | German |
| 2001170 | Computing for the Hobbyist and Small Business | - | English |
| 2000095 | Computing is Easy | - | English |
| 2001353 | Conheça os Computadores | - | Portuguese |
| 2000851 | Conquering Adventure Games | - | English |
| 2001422 | Contabilidad con Spectrum: Contatex | - | Spanish |
| 2000985 | Continuing BASIC | - | English |
| 2001234 | Corish's Computer Games Guide | - | English |
| 2000096 | Counting on QL Abacus | Sinclair QL | English |
| 2000640 | Cracking the Code on the Sinclair ZX Spectrum | - | English |
| 2000098 | Creating Adventure Programs on Your ZX Spectrum | - | English |
| 2000099 | Creating Arcade Games on Your ZX Spectrum | - | English |