Cita APA (7th ed.)

Smith, A. L., & Biddle, S. (2008). Youth physical activity and sedentary behavior: Challenges and solutions. Human Kinetics.

Cita Chicago (17th ed.)

Smith, Alan L., i Stuart Biddle. Youth Physical Activity and Sedentary Behavior: Challenges and Solutions. Champaign, Ill: Human Kinetics, 2008.

Cita MLA (9th ed.)

Smith, Alan L., i Stuart Biddle. Youth Physical Activity and Sedentary Behavior: Challenges and Solutions. Human Kinetics, 2008.