Widyaningsih E. Application Of The Group Investigation Model, Using Whatsapp To Increase Learning Outcomes For Class VI Students Of Sd Negeri Trayu Samigaluh Academic Year 2020/2021. Int. J. Chem. Educ. Res. [Internet]. 2022 Oct. 10 [cited 2024 May 8];6(2):102-7. Available from: https://journal.uii.ac.id/IJCER/article/view/22682