Barbosa, Silmara de Carvalho, et al. “CONSUMER PROFILE AND PRICE VARIATION OF AGRO-ECOLOGICAL PRODUCTS”. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], vol. 41, no. 4, Dec. 2011, pp. 602-9, https://doi.org/10.5216/pat.v41i4.11854.