| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 2000 | 978-0-9841216-0-1 | Kevin J Ruff | Freshwater Test Kit Review |
| 2009 | 978-0-9841216-1-8 | '' | Freshwater Aquarium Chemistry: A Comprehensive Guide for Tropical Fish Hobbyists |
| 2010 | 978-0-9841216-2-5 | Kevin J. Ruff | Freshwater Test Kit Review 2010 |