Marfi Ario. “APPLICATION OF LESSON STUDY IN THE CALCULUS I LECTURE IN THE MATHEMATIC EDUCATION STUDY PROGRAM”. Apotema : Jurnal Program Studi Pendidikan Matematika 6, no. 2 (August 11, 2020): 112–122. Accessed August 7, 2025. http://publikasi.stkippgri-bkl.ac.id/index.php/APM/article/view/205.