Agboola, D. A., W. F. Idowu, and M. Kadiri. 2006. “Seed Germination and Seedling Growth of the Mexican Sunflower Tithonia Diversifolia (Compositae) in Nigeria, Africa”. Revista De Biología Tropical 54 (2):395–402. https://doi.org/10.15517/rbt.v54i2.13881.