Lestari, V. A. ., A. N. . Mutawally, A. B. . Purba, W. . Yasmin, A. . Hilman, W. . Wahyudi, and L. . Ludovikus. “A Comparative Study Of Student Perceptions On Vocabulary Learning Using Duolingo And Elsa”. Journal of Innovative and Creativity, vol. 5, no. 2, July 2025, pp. 15055-64, doi:10.31004/joecy.v5i2.595.