NAIDU, L G K et al. Mapping of agro-ecological zones of Andhra Pradesh through soil-resource data. The Indian Journal of Agricultural Sciences, Delhi, India, v. 68, n. 10, 2013. Disponível em: https://epubs.icar.org.in/index.php/IJAgS/article/view/27745. Acesso em: 28 oct. 2025.