Tony Frisk
Undertale- Undertale Who Are You
- Undertale: Another War : (an Unofficial Undertale Book)
- Undertale: Overworld : (an Unofficial Undertale Book)
- Undertale: Underschool 6 : (an Unofficial Undertale Book)
- Undertale: Underschool : Book 1: (an Unofficial Undertale Book)
- Undertale: Underschool : Book 4: (an Unofficial Undertale Book)
- Undertale: Underschool Book 3 : (an Unofficial Undertale Book)
- Undertale: Underschool Book 5 : (an Unofficial Undertale Book)