Preston, Alan. “The Puerto Rico Journal of Public Health and Tropical Medicine (1925-1949): Coverage of Tropical Sprue”. Puerto Rico Health Sciences Journal 42, no. 2 (June 15, 2023): 91–101. Accessed November 16, 2025. https://prhsj.rcm.upr.edu/index.php/prhsj/article/view/3227.