McMinn, D., N. M. Oreskovic, M. J. Aitkenhead, D. W. Johnston, S. Murtagh, and D. A. Rowe. “The Physical Environment and Health-Enhancing Activity During the School Commute: Global Positioning System, Geographical Information Systems and Accelerometry”. Geospatial Health, vol. 8, no. 2, May 2014, pp. 569-72, doi:10.4081/gh.2014.46.