| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Cthulhu Invictus: A Sourcebook for Ancient Rome | 978-1-56882-305-8 (1-56882-305-3) | 2009 | Chad Bowser |
| Cthulhu Invictus Companion: The Mythos Threatens Ancient Rome | 978-1-56882-337-9 (1-56882-337-1) | 2011 | Chad Bowser · and friends |