Powell, L. M., O'Malley, P. M., Johnston, L. D., Slater, S. J., & Chaloupka, F. J. (2007). The availability of local-area commercial physical activity-related facilities and physical activity among adolescents. American journal of preventive medicine, 33(4, Suppl), . doi:10.1016/j.amepre.2007.07.002
Cita Chicago Style (17a ed.)Powell, Lisa M., Patrick M. O'Malley, Lloyd D. Johnston, Sandy J. Slater, y Frank J. Chaloupka. "The Availability of Local-area Commercial Physical Activity-related Facilities and Physical Activity Among Adolescents." American Journal of Preventive Medicine 33, no. 4, Suppl (2007). https://doi.org/10.1016/j.amepre.2007.07.002.
Cita MLA (9a ed.)Powell, Lisa M., et al. "The Availability of Local-area Commercial Physical Activity-related Facilities and Physical Activity Among Adolescents." American Journal of Preventive Medicine, vol. 33, no. 4, Suppl, 2007, https://doi.org/10.1016/j.amepre.2007.07.002.