Christie, N., Kimberlee, R., Towner, E., Rodgers, S., Ward, H., Sleney, J., & Lyons, R. (2011). Children aged 9-14 living in disadvantaged areas in England: Opportunities and barriers for cycling. Journal of Transport Geography, 19(4), 943-949. https://doi.org/10.1016/j.jtrangeo.2010.12.003