“TEORI INSTITUSI: TEKANAN PERSEKITARAN DALAM PENGURUSAN PENSIJILAN HALAL: Institutional Theory: Environmental Pressure in Halal Certification Management”. 2018. Journal of Muwafaqat 1 (2): 1-21. https://www.muwafaqat.uis.edu.my.kuisjournal.com/index.php/journal/article/view/53.