Rodríguez de Cianzio, Silvia, and Carlos E. Ortiz. “A Visual Indicator for Harvest of Immature Viable Seed of Indeterminate Soybean Genotypes”. The Journal of Agriculture of the University of Puerto Rico 77, no. 1-2 (April 1, 1993): 33–43. Accessed November 30, 2022. https://revistas.upr.edu/index.php/jaupr/article/view/4164.