| Source | Date | Type | Role |
|---|---|---|---|
| A History of Western Philosophy | 1945 | Book | Publisher |
| How to Read a Book, Revised and Updated Edition | 1972 | Book | Publisher |
| Machine Language for the Commodore 64, 128, and Other Commodore Computers, Revised & Expanded Edition | 1986 | Book | Publisher |
| Sherlock Holmes and the Thistle of Scotland | 1989 | Book | Publisher |