[1]
Saftari, M., Darmawijoyo, D. dan Hartono, Y. 2020. Development of student activities sheet based on apos theory to understand the concept of Riemann sum. Math Didactic: Jurnal Pendidikan Matematika. 6, 1 (Mei 2020), 110-123. DOI:https://doi.org/10.33654/math.v6i1.914.