Sarmidi Sarmidi, Yulius Mases and Age Palogan Kesuma 2023. Analisis Efisiensi Jam Kerja Excavator CAT 345 GC di Area Penambangan Pit E Banko Barat PT. Rifansi Dwi Putra. Jurnal Ilmiah Teknik dan Sains. 1, 1 (Aug. 2023), 11–18. DOI:https://doi.org/10.62278/jits.v1i1.3.