Berampu, S., and D. Darmilisani. “Analysis of Work Environment, Work Motivation, and Job Training on Work Productivity at PT OCS Global Services”. EKOMBIS REVIEW: Jurnal Ilmiah Ekonomi Dan Bisnis, Vol. 13, no. 4, Sept. 2025, pp. 3229–3244, doi:10.37676/ekombis.v13i4.8325.