P. R. Syafrayani dan T. A. Hatta, “Improving EFL Students’ English Speaking Skills at Universitas Muhammadiyah Sumatera Utara through the Cake Application”, Altafani, vol. 1, no. 2, Sep 2024, Diakses: Nov 14, 2026. Tersedia pada: https://jurnal2.umsu.ac.id/index.php/altafani/article/view/70