Agboola, D.A., Idowu, W.F. y Kadiri, M. 2006. Seed germination and seedling growth of the Mexican sunflower Tithonia diversifolia (Compositae) in Nigeria, Africa. Revista de Biología Tropical. 54, 2 (jun. 2006), 395–402. DOI:https://doi.org/10.15517/rbt.v54i2.13881.