@article{Usmadi_Diana Sari_Ergusni_2022, title={THE EFFECTIVENESS OF COOPERATIVE LEARNING MODEL NUMBERED HEAD TYPE TO STUDENT MATHEMATICS PROBLEM SOLVING ABILITY}, volume={5}, url={https://gphjournal.org/index.php/er/article/view/542}, DOI={10.5281/zenodo.6849497}, number={01}, journal={GPH-International Journal of Educational Research}, author={Usmadi, . and Diana Sari, Putri and Ergusni, .}, year={2022}, month={Jan.}, pages={12-22}