Cita APA

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

Citación estilo Chicago

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

Cita MLA

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