JOHNSON, Donald M. A Three Year Study Of Student Achievement And Factors Related To Achievement In a State FFA Agricultural Mechanics Contest. Journal of Agricultural Education, [S. l.], v. 34, n. 4, p. 39–45, 1993. DOI: 10.5032/jae.1993.04039. Disponível em: https://jae-online.org/index.php/jae/article/view/1904. Acesso em: 25 nov. 2024.