G. B. Usadani, O. R. Mardasari, D. Y. Pratomo, R. Yuriananta, and D. N. S. R. Rabbani, “Development of the ‘Industrial Mandarin’ MOOC for Practical Mandarin Language Learning in the Manufacturing and Technology Sectors”, Onoma, vol. 12, no. 1, pp. 515–521, Feb. 2026.