| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Timemanagement volgens Covey | 978-90-470-1906-0 (90-470-1906-7) | 2010 | Stephen Covey · Stephen R. Covey · Rebecca Merrill |
| Timemanagement volgens Covey: handzame ingekorte editie van prioriteiten | 978-90-470-0755-5 (90-470-0755-7) | 2014 | Stephen R. Covey · Rebecca Merrill |
A. Roger Merrill · R. M. · Roger Merle · Roger Merrill and Stephen R. Covey · Roger Morrell