Yulianti, Yuli. 2019. “METODE TUTOR SEBAYA BERBANTUAN WHATSAPP UNTUK MENINGKATKAN HASIL UJI COBA UJIAN NASIONAL DI SMK NEGERI 1 TANJUNGPANDAN”. IDEAL MATHEDU: Indonesian Digital Journal of Mathematics and Education 6 (2), 691-703. http://p4tkmatematika.kemdikbud.go.id/journals/index.php/idealmathedu/article/view/57.