Karpyn, A., K. Tappe, A. Hillier, C. Cannuscio, J. Koprak, and K. Glanz. “Where Urban Residents Shop for Produce”. Journal of Agriculture, Food Systems, and Community Development, Vol. 4, no. 4, Sept. 2014, pp. 129–141, doi:10.5304/jafscd.2014.044.009.