Yulianti, Y. (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. Retrieved from http://p4tkmatematika.kemdikbud.go.id/journals/index.php/idealmathedu/article/view/57