Hunold, C., Y. Sorunmu, R. Lindy, S. Spatari, and P. L. Gurian. “Is Urban Agriculture Financially Sustainable? An Exploratory Study of Small-Scale Market Farming in Philadelphia, Pennsylvania”. Journal of Agriculture, Food Systems, and Community Development, vol. 7, no. 2, Mar. 2017, pp. 51-67, doi:10.5304/jafscd.2017.072.012.