Harahap, J. B., and Tika Indria. “The Relationship Between Communication Skills and Organizational Culture and Employe Work Effectiveness: A Case Study of UPT Balai Yasa Pulubrayan PT. Kereta Api Indonesia (Persero)”. International Journal of Enterprise Modelling, vol. 20, no. 1, Jan. 2026, pp. 72-80, doi:10.35335/int.jo.emod.v20i1.167.