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 2025May11];5(1):63-2. Available from: http://103.8.12.212:33180/unj/index.php/jpeb/article/view/1934