Putriana, and C. Ahmad Sahputra. “The Effect of Discipline and Work Environment on Employee Productivity of Palm Oil Factory (PKS) of PT. Perkebunan Nusantara V Sei. Rokan, Pagaran Tapah Subdistrict, Rokan Hulu Regency, Riau”. INTERNATIONAL JOURNAL OF TRENDS IN ACCOUNTING RESEARCH, vol. 2, no. 2, Nov. 2021, pp. 193-04, https://jurnal.adai.or.id/index.php/ijtar/article/view/80.