| title | ISBN-13 | year of publication |
|---|---|---|
| Closer to the Void: Ozy and Millie 2006-2007 | 978-1-4357-0504-3 | 2008 |
| Perpetual Motion: Ozy and Millie, 2002-2003 | 978-1-4303-2116-3 | 2008 |
| Prehistrionics: Ozy and Millie, 1997-2000 | 978-1-84728-773-1 | 2006 |
| The Big Book of Ancient, Semi-Coherent Wisdom: Ozy and Millie, 2000-2001 | 978-1-4303-1505-6 | 2008 |
| Tofu Knights: Ozy and Millie, 2004-2005 | 978-1-84728-772-4 | 2006 |
| Zen Again: Ozy and Millie, 2001-2002 | 978-1-4303-1508-7 | 2008 |
C.S. · C. Simpson · D.C. · D S · D. Simpson · David Craig Simpson · Dr April Combs-Simpson · Dr. Charles Simpson