Ferdiansyah, A. C. D., and I. G. A. A. Wulandari. “RiTAS Application Oriented to Ausubel Learning Theory for Social Studies Content: Validity and Feasibility”. Journal of Education Technology, vol. 5, no. 1, Mar. 2021, pp. 113-22, doi:10.23887/jet.v5i1.32740.