1.
Sulastri YL, Ahmatika D. Analisis Keterampilan Abad 21 Melalui Model Problem Based Calculus Learning Berbantuan Geogebra. supremum j of mathematics education [Internet]. 2020 Jan. 24 [cited 2026 Jan. 22];4(1):42-54. Available from: https://journal-fkip.unsika.ac.id/index.php/supremum/article/view/2254