BREVIK, Eric C. et al. Soil Science Education in the United States: History and Current Enrollment Trends. Journal of the Indian Society of Soil Science, India, v. 62, n. 4, 2015. Disponível em: https://epubs.icar.org.in/index.php/JISSS/article/view/47168. Acesso em: 25 oct. 2025.