Ndruru, Fihabudi, Kurniawan Sarototonafo Zai, Martha Surya Dinata Mendrofa, and Tiarni Duha. “ Evaluation Of Halal Certification Implementation In Improving Product Quality At CV. Werry Group Gunungsitoli ”. Journal of Management, Economic, and Accounting 4, no. 2 (August 9, 2025): 713–726. Accessed June 23, 2026. https://jurnalunived.com/index.php/JMEA/article/view/906.