Rahmisafa binti Hamid, et al. “ISO 9001 CERTIFICATION AND SERVICE QUALITY DELIVERY IN MALAYSIAN HIGHER EDUCATION INSTITUTIONS: A CONCEPTUAL MODEL ”. International Journal of Humanities Technology and Civilization, vol. 6, no. 1, July 2021, pp. 60-65, https://doi.org/10.15282/ijhtc.v6i1.6671.