Hadisaputraa, P., A. Yussuf, and T. S. A. Tengku Kasim. “Islamic Educational Tradition: Rebuilding Sufi Traditions in Nahdlatul Wathan Madrasas”. Online Journal of Research in Islamic Studies, vol. 7, no. 1, Sept. 2020, pp. 17-30, http://ijie.um.edu.my/index.php/RIS/article/view/26212.