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