D. Christopher · Dirk Christoffers · Doris Christensen · Doris Christinger · Doris Christopher
| title | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|
| Computing Projects in Visual Basic | 978-1-903112-33-5 (1-903112-33-8) | 2000 |
| Computing Projects in Visual Basic.NET | 978-1-903112-91-5 (1-903112-91-5) | 2003 |
| Visual Basic for AVCE: VBAVCE: Edexcel Units 7 and 22 Pt.1 | 978-1-903112-59-5 (1-903112-59-1) | 2001 |