González, M. A., J. R. Benero, and F. Sánchez Nieva. “Effect of Age of Roots on Yield for Canning Purposes, Chemical Composition of Raw Roots, and Quality of Canned Product of Cobre and U.P.R.3 Sweetpotatoes”. The Journal of Agriculture of the University of Puerto Rico 45, no. 4 (October 1, 1961): 259–264. Accessed June 2, 2023. https://revistas.upr.edu/index.php/jaupr/article/view/13762.