Snyder, L. A., Alice R. Hernández, and H. E. Warmke. “The Mechanism of Apomixis in Pennisetum Ciliare”. The Journal of Agriculture of the University of Puerto Rico 39, no. 3 (July 1, 1955): 150–164. Accessed March 29, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/12677.