Haryani, K. et al. 2018. Evaluasi Efesiensi Reaktor Urea (R-201) Pabrik Urea 1A PT. Pupuk Kalimantan Timur. Jurnal Rekayasa Mesin. 13, 3 (Dec. 2018), 79–83. DOI:https://doi.org/10.32497/rm.v13i3.1284.