| Name | Count | Years active |
|---|---|---|
| Houghton Mifflin | 61 | 1988, 1999-2001, 2007-2009 |
| Houghton Mifflin Harcourt | 52 | 2008-2009 |
| Houghton Mifflin Co. | 31 | 2008 |
| Clarion Books | 6 | 2008 |
| Houghton Mifflin Harcourt Pub. Co. | 4 | 2008-2009 |
| Houghton Mifflin/Harcourt | 4 | 2008 |
| Houghton Mifflin Company | 3 | 2008 |
| Wadsworth | 2 | 2009 |
| Graphia | 2 | 2008 |
| Brooks/Cole Cengage Learning | 2 | 2010 |