Saragih S, Afriati V. Peningkatan Pemahaman Konsep Grafik Fungsi Trigonometri Siswa SMK melalui Penemuan Terbimbing Berbantuan Software Autograph. JPNK [Internet]. 2012Dec.31 [cited 2025Oct.15];18(4):368-81. Available from: https://jurnal.bskap.id/index.php/jpnk/article/view/95