Nalom Dahlan Marpaung, “ANALISIS EXCAVATOR TERHADAP LOADING GEOMETRIKERJAPADA KEGIATAN COAL GETTING DIPT.PAMAPERSADANUSANTARA JOB SITE MTBUKABUPATEN MUARA ENIM, PROVINSI SUMATERA SELATAN”, jsti, vol. 13, no. 1, pp. 58–68, Aug. 2021.