J.K. · Jason Korol · Joachim Karl · Joachim Kröll · Joachim Krol
| title | ISBN-13 | year of publica- tion |
|---|---|---|
| 21st Century Ghosts | 978-1-84537-537-9 | 2007 |
| An Illustrated History of the Haunted World | 978-1-84537-687-1 | 2007 |
| Jason Karl's Great Ghost Hunt | 978-1-84537-430-3 | 2006 |
| Jason Karl's Great Ghost Hunt: A Spectral Journey Through Britain's Haunted Realms | 978-1-84330-735-8 | 2004 |