| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Intermediate Algebra Programmed | 978-0-201-15880-9 (0-201-15880-9) | 1986 | Allen S. Christenson · Keith J. Roberts |
| Introductory Algebra Programmed | 978-0-201-15887-8 (0-201-15887-6) | 1986 | Allan A. Christenson · Keith J. Roberts |