Ramos-Santana, Rafael, and José E. Rodríguez. “FIELD OBSERVATIONS ON THE FLOWERING BEHAVIOR PATTERN OF FOUR GRASS GENERA”. The Journal of Agriculture of the University of Puerto Rico 73, no. 4 (October 1, 1989): 405–410. Accessed April 19, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/6324.