R. P. ยท Roger Protz
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Matt and Spencer in Their Great Adventure | 978-1-4137-6638-7 (1-4137-6638-2) | 2005 | Birgit Pratcher |
| One Family's Adventure: The Cheating Landlords | 978-1-4137-7075-9 (1-4137-7075-4) | 2005 | Brigit Pratcher |