| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Purple 2010-2011: The Unofficial Student Guide to Happy, Healthy Living at Northwestern | 978-1-4537-2782-9 (1-4537-2782-5) | 2010 | Drew Deitch · Sean Soderstrom |
| Purple: The Unofficial Student Guide to Happy, Healthy Living at Northwestern | 978-1-4486-9117-3 (1-4486-9117-6) | 2009 | Sean Soderstrom |