| title | ISBN-13 | year of publication |
|---|---|---|
| Interface projects for the Apple II | 978-0-13-469387-3 | 1982 |
| Interface Projects for the Apple II | 978-0-13-469395-8 | 1982 |
| Interface projects for the TRS-80 | 978-0-13-469429-0 | 1982 |
| Interface projects for the TRS-80 | 978-0-13-469437-5 | 1982 |
C.H. · R. C. · R C H · R. H. · Richard C. · Richard H. · Richard Hallgren