Khoiril Chilmy, et al. “PERFORMANCE APPRAISAL SYSTEM AT PT PETROKIMIA GRESIK : SYSTEM, IMPLEMENTATION, AND RECOMMENDATIONS”. Interdisciplinary Journal of Global and Multidisciplinary, vol. 2, no. 1, Jan. 2026, pp. 10-20, https://jurnal-ijgam.or.id/index.php/IJGAM/article/view/74.