“TEORI INSTITUSI: TEKANAN PERSEKITARAN DALAM PENGURUSAN PENSIJILAN HALAL: Institutional Theory: Environmental Pressure in Halal Certification Management”. Journal of Muwafaqat 1, no. 2 (December 31, 2018): 1–21. Accessed July 13, 2026. https://muwafaqat.uis.edu.my/index.php/journal/article/view/53.