Swagemakers, P., M. Domínguez García, X. Fernández, and J. Wiskerke. “Unfolding Farm Practices: Working Toward Sustainable Food Production in the Netherlands and Spain”. Journal of Agriculture, Food Systems, and Community Development, Vol. 2, no. 2, Feb. 2012, pp. 129-45, doi:10.5304/jafscd.2012.022.001.