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