BOONE, Harry N. Effect Of Level Of Problem Solving Approach To Teaching On Student Achievement And Retention. Journal of Agricultural Education, [S. l.], v. 31, n. 1, p. 18–26, 1990. DOI: 10.5032/jae.1990.01018. Disponível em: https://jae-online.org/index.php/jae/article/view/1222. Acesso em: 16 jul. 2024.