Muttaqin, Firman, and Nuril Huda. “The Effect of Implementing Good Manufacturing Practices and Having a Halal Certificate on Competitiveness and Marketing Performance ”. JENIUS (Jurnal Ilmiah Manajemen Sumber Daya Manusia) 9, no. 1 (September 21, 2025): 31–43. Accessed March 5, 2026. https://openjournal.unpam.ac.id/index.php/JJSDM/article/view/52273.