ROZY, Fahrur. Cover. ROTOR, [S.l.], v. 11, n. 2, nov. 2018. ISSN 2460-0385. Available at: <https://jurnal.unej.ac.id/index.php/RTR/article/view/9648>. Date accessed: 17 july 2019. doi: https://doi.org/10.19184/rotor.v11i2.9648.