| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Study Guide to accompany Principles of Economics, 4th Edition | 978-0-07-336271-7 (0-07-336271-9) | 2009 | Jack Mogab |
| Study Guide to accompany Principles of Economics | 978-0-07-321006-3 (0-07-321006-4) | 2005 | " |