Calva, Edmundo, and Juan J. Calva. “Country Report: Typhoid Fever and Other Salmonellosis in Mexico”. Medical Journal of Indonesia 7, no. Supp1 (October 1, 1998): 17-9. Accessed April 20, 2024. http://mji.ui.ac.id/journal/index.php/mji/article/view/1021.