| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Excel 4.0 for Macintosh: Tutorial and Applications | 978-0-538-62276-9 | 1900 | |
| Excel 4.0 for Windows: Tutorial and Applications | 978-0-538-62275-2 | 1994 | Drum |
| Ppkg TD IBM 3"/Text, Using PFS: :1st Choic | 978-0-538-70607-0 | 1999 | William O. Drum · M.J. Jansen |
| Ppkg TD IBM 5"/Txt-Using PFS: :1st Choice | 978-0-538-70606-3 | 1999 | William O. Drum · M.J. Jansen |
| Using dBASE IV for Database Applications | 978-0-538-61589-1 | 1992 | William O. Drum |
| Using dBASE IV for Database Applications : | 978-0-538-61591-4 | 1992 | |
| Using dBASE IV for Database Applications : | 978-0-538-61590-7 | 1991 | |
| Using PFS: First Choice | 978-0-538-60703-2 | 1990 | |
| Using Pfs: First Choice, Tutorial and Applications | 978-0-538-60700-1 | 1990 | William Drum |
J J · J. Jansen · M J · M.J. Jansen · M. Jansen · Martin J. · Martin Jansen