The effectiveness of Jiu-Jitsu in real fights came into prominence in the early 90's when jiu-jitsu expert Royce Gracie won the Ultimate Fighting Championships fighting against much larger opponents.
This book is a must for all martial artists regardless of their style.
With more than 1,000 photos and a clear and descriptive narrative, The Essence of Brazilian Jiu-Jitsu is one of the classic books about this martial art system.