Yurnan, R. “ANALYSIS OF IMPLEMENTATION OCCUPATIONAL HEALTH AND SAFETY MANAGEMENT SYSTEM (OHSMS) AT HOSPITAL X PEKANBARU AT 2020”. Jurnal Kesehatan Masyarakat Andalas, vol. 15, no. 1, Mar. 2021, pp. 3-12, doi:10.24893/jkma.v15i1.619.