Frehlich, L., C. Friedenreich, A. Nettel-Aguirre, and G. R. McCormack. “Test-Retest Reliability of a Modified International Physical Activity Questionnaire (IPAQ) to Capture Neighbourhood Physical Activity”. Journal of Human Sport and Exercise, vol. 13, no. 1, Mar. 2018, pp. 174-87, doi:10.14198/jhse.2018.131.17.