| Name | Count | Years active |
|---|---|---|
| Longman | 1484 | 1997-2010 |
| Addison-Wesley | 1020 | 1988, 1995, 1997-2010 |
| Peachpit Press | 703 | 2000, 2002-2009 |
| Pearson Longman | 586 | 2003-2009 |
| Pearson/Longman | 535 | 2001-2009 |
| Peachpit | 401 | 2002-2009 |
| New Riders | 202 | 2004-2009 |
| Pearson Addison Wesley | 201 | 2003-2010 |
| Allyn and Bacon | 166 | 1999-2005 |
| Pearson/Addison Wesley | 160 | 2003-2011 |