Wijaya, Bryanna Jersey, and Sonata Christian. “The Relationship Between Product Knowledge and Salesperson Training Toward Salesperson Performance Mediated by Work Attitude in Real Estate Industry”. Jurnal Ekonomi Manajemen Sistem Informasi 8, no. 1 (September 23, 2025): 571–581. Accessed September 26, 2026. https://dinastirev.org/JEMSI/article/view/9742.