- Livre électroniqueThe Advancing Guitarist's WorkbookMichael Gumley
- Livre électroniqueLittle Ninjas Guitar Method BookMichael Gumley
- Livre électroniqueThe Guitar Ninjas Orange Belt BookMichael Gumley
- Livre électroniqueThe Ultimate Adult Beginner Guitar Method Book For The Hobby PlayerMichael Gumley
- Livre électroniqueThe Guitar Ninjas Green Belt BookMichael Gumley
- Livre électroniqueThe Guitar Ninjas Yellow Belt BookMichael Gumley
- Livre électroniqueThe Guitar Ninjas Blue Belt BookMichael Gumley