Darmayanti Y. PENGARUH LINGKUNGAN KERJA DAN STANDAR OPERASIONAL PROSEDUR TERHADAP PRODUKTIVITAS KERJA KARYAWAN PENGAWAS URUSAN GERBONG SUKACINTA(PUG SCT) PT. KERETA API INDONESIA (PERSERO) KABUPATEN LAHAT. JPEB [Internet]. 2017Mar.30 [cited 2024Apr.25];5(1):63-2. Available from: https://journal.unj.ac.id/unj/index.php/jpeb/article/view/1934