. D, Riyadi S, . A, Sibuea AM, 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 [Internet]. 2023Mar.3 [cited 2024Apr.26];8(4):151–157. Available from: https://knepublishing.com/index.php/KnE-Social/article/view/12894