LOREEN, C. Oscar. Teacher Certification Changes. Journal of Agricultural Education, [S. l.], v. 1, n. 2, p. 21–22, 1960. DOI: 10.5032/jaatea.1960.02021. Disponível em: https://jae-online.org/index.php/jae/article/view/851. Acesso em: 13 jul. 2024.