| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The Island | 978-0-9829999-5-0 (0-9829999-5-X) | 2014 |
| The Portal | 978-0-9829999-4-3 (0-9829999-4-1) | 2013 |
G. A. Penn · G. P. · Gareth Penn · Garlene Penn · Graham Penn · Granville Penn · Gregory E. Penn · Gregory Penn · Jowan G. Penn-Barwell · R.G. Penn