Yusuf, A. H., I. O. Oyelakin, S. Abdul Shukor, and U. S. Ahmad Bustamam. “THE ROLE OF HALAL CERTIFICATION IN BUSINESS PERFORMANCE IN SELANGOR: A STUDY ON KOPITIAMS”. Malaysian Management Journal, vol. 21, Dec. 2017, pp. 1-22, doi:10.32890/mmj.21.2017.9052.