JOHNSON, Donald M.; SCHUMACHER, Leon G.; STEWART, Bob R. An Analysis Of The Agricultural Mechanics Laboratory Management Inservice Needs Of Missouri Agriculture Teachers. Journal of Agricultural Education, [S. l.], v. 31, n. 2, p. 35–39, 1990. DOI: 10.5032/jae.1990.02035. Disponível em: https://jae-online.org/index.php/jae/article/view/1606. Acesso em: 30 apr. 2026.