Widiana, I.W., Tegeh, I.M., Parwata, I.G.L.A. and ., H. 2020. Improving Student’s Factual Knowledge with Concrete Media through Observing Activities in Scientific Approaches in Elementary Schools. Journal of Education and e-Learning Research. 7, 3 (Aug. 2020), 293–299. DOI:https://doi.org/10.20448/journal.509.2020.73.293.299.