Kumalasari, M.Y.P. et al. 2020. THE IMPLEMENTATION OF STUDENT PORTFOLIOS TO IMPROVE GRADE 9 STUDENTS’ POSITIVE ATTITUDES TOWARD ASSESSMENTS AT AN INTERNATIONAL SCHOOL IN BOGOR. JOHME: Journal of Holistic Mathematics Education. 4, 1 (Oct. 2020), 102–112. DOI:https://doi.org/10.19166/johme.v4i1.1614.