LUDDEN, M. T.; WELSH, R.; WEISSMAN, E.; HILCHEY, D.; GILLESPIE, G. W.; GUPTILL, A. The Progressive Agriculture Index: Assessing the Advancement of Agri-food Systems. Journal of Agriculture, Food Systems, and Community Development, Ithaca, NY, USA, v. 8, n. 3, p. 159–185, 2018. DOI: 10.5304/jafscd.2018.083.003. Disponível em: https://www.foodsystemsjournal.org/index.php/fsj/article/view/624. Acesso em: 26 may. 2022.