| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 2008 | 978-0-9560515-0-9 | Geoffrey Pidgeon | Edgar Harrison - Soldier, Patriot and ULTRA Wireless Operator to Winston Churchill |
| '' | 978-0-9560515-1-6 | Geoffrey Pidgeon | Edgar Harrison - Soldier, Patriot and Ultra Wireless Operator to Winston Churchill |
| '' | 978-0-9560515-2-3 | '' | The Secret Wireless War |