WIEGERS, George W. Certification Of Teachers Of Vocational Agriculture. Journal of Agricultural Education, [S. l.], v. 7, n. 2, p. 14–17, 1966. DOI: 10.5032/jaatea.1966.02014. Disponível em: https://jae-online.org/index.php/jae/article/view/1670. Acesso em: 18 sep. 2024.