BIRKENHOLZ, Robert J.; HARBSTREIT, Steven R.; LAW, Dale A. Research Priorities For Adult Education In Agriculture In The North Central Region. Journal of Agricultural Education, [S. l.], v. 31, n. 4, p. 32–38, 1990. DOI: 10.5032/jae.1990.04032. Disponível em: https://jae-online.org/index.php/jae/article/view/2203. Acesso em: 30 apr. 2026.