Kumalasari, Maria Yashinta Putri, e.a. ‘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, vol. 4, nr. 1, oktober 2020, pp. 102-1, doi:10.19166/johme.v4i1.1614.