Gimeno-Santos, E., Frei, A., Dobbels, F., Rüdell, K., Puhan, M. A., & Garcia-Aymerich, J. (2011). Validity of instruments to measure physical activity may be questionable due to a lack of conceptual frameworks: A systematic review. BioMed Central.
Chicago Style CitationGimeno-Santos, Elena, Anja Frei, Fabienne Dobbels, Katja Rüdell, Milo A. Puhan, and Judith Garcia-Aymerich. Validity of Instruments to Measure Physical Activity May Be Questionable Due to a Lack of Conceptual Frameworks: A Systematic Review. BioMed Central, 2011.
MLA CitationGimeno-Santos, Elena, et al. Validity of Instruments to Measure Physical Activity May Be Questionable Due to a Lack of Conceptual Frameworks: A Systematic Review. BioMed Central, 2011.
Warning: These citations may not always be 100% accurate.