Caffeinated Book Dragon rated Mastering The 21 Immutable Principles Of Brazilian Jiu-Jitsu: The Ultimate Handbook for Brazilian Jiu-Jitsu Students: Show rating 3 stars July 1, 2023 Public Mastering The 21 Immutable Principles Of Brazilian Jiu-Jitsu: The Ultimate Handbook for Brazilian Jiu-Jitsu Students by Paulo Guillobel, Dirk Anderson, Teresa De La Cruz, and 1 other