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Murfid NA, Widaningrum S, Safrudin YN. Designing SOP for physical work environment maintenance based on ISO 14001: 2015 and Permenaker No.5 of 2018 at PT XYZ. OE [Internet]. 2025 Jul. 31 [cited 2026 May 28];17(2):190-20. Available from: https://training-ojs3-publikasi.mercubuana.ac.id/index.php/oe/article/view/29612