Kalsum, Umi, et al. “The Use of Flashcards in Vocabulary Mastery of The Students With Down Syndrom at SLB Negeri Pagaralam”. JEIT (Journal of Educational Innovations and Technologies), vol. 1, no. 2, Aug. 2025, pp. 34-43, https://doi.org/10.63324/jeit.1.2.2025.68.