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Jago, Russell, Rowan Brockman, Kenneth R. Fox, Kim Cartwright, Angie S. Page, and Janice L. Thompson. Friendship Groups and Physical Activity: Qualitative Findings On How Physical Activity Is Initiated and Maintained Among 10–11 Year Old Children. BioMed Central, 2009.

Jago, Russell, et al. Friendship Groups and Physical Activity: Qualitative Findings On How Physical Activity Is Initiated and Maintained Among 10–11 Year Old Children. BioMed Central, 2009.