A Yanuar, A, et al. “The Implementation of ISO 9001 Certification to Improve the Competitive Advantage of Private Higher Education”. Proceeding Interuniversity Forum for Strengthening Academic Competency, vol. 1, no. 1, May 2019, pp. 258-65, https://proceedings.conference.unpas.ac.id/index.php/ifsac/article/view/165.