JOHNSON, Wayne; WILLIAMS, David L. Teaching Tractor Service Skills In Vocational Agriculture. Journal of Agricultural Education, [S. l.], v. 22, n. 2, p. 19–27, 1981. DOI: 10.5032/jaatea.1981.02019. Disponível em: https://jae-online.org/index.php/jae/article/view/1504. Acesso em: 10 aug. 2024.