Cita APA (7a ed.)

Brittenham, D., & Brittenham, G. (1997). Stronger abs and back. Human Kinetics.

Cita Chicago Style (17a ed.)

Brittenham, Dean, y Greg Brittenham. Stronger Abs and Back. Champaign, IL: Human Kinetics, 1997.

Cita MLA (9a ed.)

Brittenham, Dean, y Greg Brittenham. Stronger Abs and Back. Human Kinetics, 1997.