MURPHY, Tim H. AN EVALUATION OF A DISTANCE EDUCATION COURSE DESIGN FOR GENERAL SOILS. Journal of Agricultural Education, [S. l.], v. 41, n. 3, p. 103–113, 2000. DOI: 10.5032/jae.2000.03103. Disponível em: https://jae-online.org/index.php/jae/article/view/813. Acesso em: 22 feb. 2025.