Isnawati, Isnawati and Dwi Yulianti, Dwi and Siti Samhati, Siti Samhati Portfolio assessment as a problem based learning model to help elementary school students’ deal with Mathematics. INTERNATIONAL JOURNAL OF EDUCATIONAL STUDIES IN SOCIAL SCIENCES, 1 (3). pp. 110-113.

Isnawati, Isnawati and Dwi, Yulianti and Siti, Samhati Portfolio assessment as a problem based learning model to help elementary school students deal with Mathematics. International Journal of Educational Studies in Social Sciences (IJESSS), 1 (3). pp. 110-113. ISSN 2797-636X

Isnawati, Isnawati and Dwi, Yulianti and Siti, Samhati Portfolio assessment as a problem based learning model to help elementary school students’ deal with Mathematics. INTERNATIONAL JOURNAL OF EDUCATIONAL STUDIES IN SOCIAL SCIENCES.