BIRKENHOLZ, Robert J.; MARICLE, Gary L. Adult Education In Agriculture: A National Survey. Journal of Agricultural Education, [S. l.], v. 32, n. 4, p. 19–24, 1991. DOI: 10.5032/jae.1991.04019. Disponível em: https://jae-online.org/index.php/jae/article/view/1422. Acesso em: 22 feb. 2025.