Brittenham, D., & Brittenham, G. (1997). Stronger abs and back. Human Kinetics.
Cita Chicago (17th ed.)Brittenham, Dean, i Greg Brittenham. Stronger Abs and Back. Champaign, IL: Human Kinetics, 1997.
Cita MLA (9th ed.)Brittenham, Dean, i Greg Brittenham. Stronger Abs and Back. Human Kinetics, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.