Tohet, M., and D. E. Cahyono. “PENINGKATAN MUTU PERGURUAN TINGGI PESANTREN MELALUI ISO 21001 : 2018”. Managere: Indonesian Journal of Educational Management, vol. 2, no. 2, Aug. 2020, pp. 157-70, http://serambi.org/index.php/managere/article/view/67.