Tukaryanto, Tukaryanto, Putriaji Hendikawati, and Sugeng Nugroho. “Peningkatan Kemampuan Penalaran Matematik Dan Percaya Diri Siswa Kelas X Melalui Model Discovery Learning”. PRISMA, Prosiding Seminar Nasional Matematika 1 (February 1, 2018): 656-662. Accessed October 31, 2020. https://journal.unnes.ac.id/sju/index.php/prisma/article/view/20211.