., D., Riyadi, S. ., ., A., Sibuea, A. M., Napitupulu, E. ., & Dongoran, P. . (2023). Implementation of Collaborative Learning Based Onenvironmental Projects Building Solution of Students Learning Cracter for Covid-19 Pandemic Time in Padangsidimpuan City. KnE Social Sciences, 8(4), 151–157. https://doi.org/10.18502/kss.v8i4.12894