The master-apprentice (MA) approach was created, developed, and promoted in the 1990s by linguist Leanne Hinton and her colleagues in the Native California Network (NCN) and later by the Advocates for Indigenous California Language Restoration (AICLS). Since then, the MA approach has been used around the world by many language communities and organizations. If you want to learn more about master-apprentice (MA) language learning programs, here are some great resources to get you started.
1) Leanne Hinton has published several books related to the MA approach:
Bringing our Languages Home: Language Revitalization for Families (2013)
How to Keep your Language Alive (2002)
The Green Book of Language Revitalization in Practice (2001, edited with Ken Hale)
2) The First Peoples' Cultural Council (FPCC) in British Columbia has a handy how-to handbook on the MA approach. And it's free!