[1]
Zega, Y.S. et al. 2026. Improving the Students’ Vocabulary by Using Duolingo at Seventh Grade of SMP Negeri 2 Gunungsitoli Utara. RIGGS: Journal of Artificial Intelligence and Digital Business. 5, 1 (Feb. 2026), 2331–2339. DOI:https://doi.org/10.31004/riggs.v5i1.6470.