Satria, Muhammad Aji, Meirina Ernawati, Bagus Wicaksono, and Sahrir Sillehu. 2022. “Observation of Sort, Set, Shine, Standardize, and Sustain in a Manufacturing Company Surabaya”. The Indonesian Journal of Occupational Safety and Health 11 (2):195-203. https://doi.org/10.20473/ijosh.v11i2.2022.195-203.