| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Economics, Holt | 978-0-03-050584-3 (0-03-050584-4) | 1997 |
| Holt Economics: Student Edition Grades 9-12 2003 | 978-0-03-064684-3 (0-03-064684-7) | 2001 |
| Holt Economics, Texas Edition | 978-0-03-066336-9 (0-03-066336-9) | 2002 |
Dr. Robert L. Pennington · L.P. · R. L · R. P. · Robert L. · Robert P. · Robert Pennington