Widjaja, Felix Firyanto, and Windu Cahyaningrum Handayani Notonagoro Suryaningrat. “Visit to Singapore Medical Journal During COVID-19 Outbreak: Learning ‘beyond’ the Expectation”. Medical Journal of Indonesia 29, no. 1 (March 26, 2020): 3-5. Accessed August 14, 2020. http://mji.ui.ac.id/journal/index.php/mji/article/view/4615.