Suryani, Irma, Dwi Sapta Aryantiningsih, Winda Parlin, Kursiah Warti Ningsih, and Suryani. 2021. “Analysis of Cleanliness, Health, Safety and Environmental Sustainability Implementation in the COVID-19 Pandemic at PT. SMK Pekanbaru”. Central Asian Journal of Medical and Natural Science 2 (6):212-18. https://doi.org/10.51699/cajmns.v2i6.508.