ANDARYANTO, A.; SOETJIPTO, B. E.; WINARNO, A. The Influence of Skill Competition Participation and Trainer Quality on Employee Performance: The Mediating Role of Learning Motivation in the Paper Manufacturing Industry. Indonesian Interdisciplinary Journal of Sharia Economics (IIJSE), v. 9, n. 2, p. 11637-11655, 13 maio 2026.