Murfid, N. A., Widaningrum, S. and Safrudin, Y. N. (2025) “Designing SOP for physical work environment maintenance based on ISO 14001: 2015 and Permenaker No.5 of 2018 at PT XYZ”, Operations Excellence: Journal of Applied Industrial Engineering. Jakarta, Indonesia, 17(2), pp. 190–200. doi: 10.22441/oe.2025.v17.i2.143.