@article{Tyas_Harjana_Wahyuningsih_2021, title={Need Analysis for the Development of STEM-PjBL Physics Teaching Materials to Improve Students’ Problem Solving Ability in the 21st Century}, volume={6}, url={http://dx.doi.org/10.22161/ijels.61.51}, DOI={10.22161/ijels.61.51}, number={1}, journal={International Journal of English Literature and Social Sciences}, publisher={AI Publications}, author={Tyas, Lis and Harjana, Harjana and Wahyuningsih, Daru}, year={2021}, pages={402–406} }