SINGH, M K; PAL, S K; THAKUR, R; VERMA, U N. Energy input-output relationship of cropping systems. The Indian Journal of Agricultural Sciences, Delhi, India, v. 67, n. 6, 2013. Disponível em: https://epubs.icar.org.in/index.php/IJAgS/article/view/29914. Acesso em: 29 oct. 2025.