Firmansyah, Nur Aldi, Achmad Wicaksono, and M Ruslin Anwar. 2021. “Health Protocol in Penataran Train During the COVID-19 Pandemic”. Civil and Environmental Science Journal (CIVENSE) 4 (2). Malang, Indonesia:163-72. https://doi.org/10.21776/ub.civense.2021.00402.6.