Ferdiansyah, Ade Citia Dewi, dan I Gusti Agung Ayu Wulandari. 2021. “RiTAS Application Oriented to Ausubel Learning Theory for Social Studies Content: Validity and Feasibility”. Journal of Education Technology 5 (1):113-22. https://doi.org/10.23887/jet.v5i1.32740.