Mutmainah, D. Sujatmiko, A. Daud, and Eliwarti, “Conventional and Digital Flashcards in Teaching Vocabulary for Indonesian Primary Schools: A Systematic Literature Review”, Scope J. English Lang. Teach., vol. 11, no. 1, pp. 19–35, Sep. 2026, doi: 10.30998/scope.v11i2.4000.