PRASAD, U K; PRASAD, T N; KUMAR, A. Effect of irrigation and nitrogen on growth and yield of sunflower (Helianthus annuus). The Indian Journal of Agricultural Sciences, Delhi, India, v. 69, n. 8, 2013. Disponível em: https://epubs.icar.org.in/index.php/IJAgS/article/view/26955. Acesso em: 28 oct. 2025.