(1)
., D.; Riyadi, S. .; ., A.; Sibuea, A. M.; Napitupulu, E. .; Dongoran, P. . Implementation of Collaborative Learning Based Onenvironmental Projects Building Solution of Students Learning Cracter for Covid-19 Pandemic Time in Padangsidimpuan City. KSS 2023, 8, 151–157.