Saad, M., M. H. . Azman Ong, A. . Mohamad Ali, N. Samat, and R. Ahmad. “Moderating Work Efficiency and Performance Through Best-Practice Certification: Management’s Perspective”. International Journal of Economics, Management and Accounting, vol. 28, no. 1, June 2020, pp. 123-40, doi:10.31436/ijema.v28i1.773.