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Welch, W. A., Swartz, A.M. , Cho, C. C., & Strath, S. J. (2016). Accuracy of Direct Observation to Assess Physical Activity in Older Adults, Journal of Aging and Physical Activity, 24(4), 583-590. Retrieved Dec 10, 2019, from https://journals.humankinetics.com/view/journals/japa/24/4/article-p583.xml

Welch, Whitney A., Ann M. Swartz, Chi C. Cho, and Scott J. Strath. "Accuracy of Direct Observation to Assess Physical Activity in Older Adults". Journal of Aging and Physical Activity 24.4: 583-590. < https://doi.org/10.1123/japa.2015-0216>. Web. 10 Dec. 2019.

Welch, Whitney A., Ann M. Swartz, Chi C. Cho, and Scott J. Strath. "Accuracy of Direct Observation to Assess Physical Activity in Older Adults", Journal of Aging and Physical Activity 24, 4: 583-590, accessed Dec 10, 2019, https://doi.org/10.1123/japa.2015-0216

Welch, W. A., Swartz, A.M. , Cho, C. C., and Strath, S. J. (2016). Accuracy of Direct Observation to Assess Physical Activity in Older Adults. Journal of Aging and Physical Activity 24, 4, 583-590, available from: < https://doi.org/10.1123/japa.2015-0216> [Accessed 10 December 2019]