f, Farihah Nabila, Amar Al Kadri, and Wulan Sari Kifki Telaumbanua. “Product Innovation and Its Impact on Firm Competitiveness: Evidence from PT Martabak Mak Yung”. Young Journal of Social Sciences and Humanities 1, no. 1 (December 31, 2025): 225–237. Accessed March 29, 2026. https://journal.sufiya.org/index.php/yjssh/article/view/237.