Siregar, Zufri Hasrudy, and Margie Subahagia Ningsih. 2019. “Implementasi Metode NIOSH Dan Analisa QEC Pada Alat Potong Ranting”. Operations Excellence: Journal of Applied Industrial Engineering 11 (1). Jakarta, Indonesia:34-48. https://doi.org/10.22441/oe.v11.1.2019.014.