Zarkasyi, A. H., and S. Ayu. “The Role of Public Speaking Training to Build Self-Confidence For Class One Intensive Students of Darussalam Gontor Islamic Boarding School for Girls”. EDUCAN : JURNAL PENDIDIKAN ISLAM, vol. 2, no. 2, Aug. 2018, pp. 72-94, doi:10.21111/educan.v2i2.3264.