| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| 6,000 most used Century 21 shorthand outlines | 978-0-538-18150-1 (0-538-18150-8) | 1974 | Devern Perry |
| Century 21 Shorthand: Book I | 978-0-538-18100-6 (0-538-18100-1) | 1975 | |
| Century 21 Shorthand Dictionary | 978-0-538-18140-2 (0-538-18140-0) | 1976 | |
E C. · E. L. · Edward Christensen · Edward L. · L. C. · L. Christensen