Azzam, H., and G. Samuels. “Yields of Tomatoes As Influenced By Application of Filter-Press Cake and Starter Solutions”. The Journal of Agriculture of the University of Puerto Rico 48, no. 1 (January 1, 1964): 55–59. Accessed December 22, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/12974.