Walker, J. (2003). Self-defense techniques & tactics. Human Kinetics.
Citazione stile Chigago Style (17a edizione)Walker, Joseph. Self-defense Techniques & Tactics. Champaign, IL: Human Kinetics, 2003.
Citatione MLA (9a ed.)Walker, Joseph. Self-defense Techniques & Tactics. Human Kinetics, 2003.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.