Aulianisa, Fida, et al. “Exploring the Use of Metafunctions in Ed Sheeran’s ‘Photograph’ Through Halliday’s Systemic Functional Linguistics”. Jurnal Penelitian Pendidikan Indonesia (JPPI), vol. 3, no. 2, Dec. 2025, pp. 289-94, https://doi.org/10.62017/jppi.v3i2.6412.