Rosyafah, Siti, Elly Yuniar Nitawati, and Nurul Iman. “Impact of Work Discipline, Work Environment, Communications and Motivation on Employee Performance in PT. KAI Gubeng Surabaya”. Jurnal Ekonomi dan Bisnis Digital 2, no. 4 (December 12, 2023): 1287–1296. Accessed June 28, 2026. https://journal.formosapublisher.org/index.php/ministal/article/view/7112.