Huhman, Marian E.; Potter, Lance D.; Duke, Jennifer C.; Judkins, David R.; Heitzler, Carrie D.; Wong, Faye L. (2007). "Evaluation of a National Physical Activity Intervention for Children". American Journal of Preventive Medicine. 32 (1): 38–43. doi:10.1016/j.amepre.2006.08.030. PMID17218189.
Huhman, Marian E.; Potter, Lance D.; Duke, Jennifer C.; Judkins, David R.; Heitzler, Carrie D.; Wong, Faye L. (2007). "Evaluation of a National Physical Activity Intervention for Children". American Journal of Preventive Medicine. 32 (1): 38–43. doi:10.1016/j.amepre.2006.08.030. PMID17218189.