Sihombing, Marino, et al. “Improving Vocabulary in Writing Recount Text at Grade VIII Students of SMP YP HKBP 1 Pematangsiantar Through Clustering Technique ”. Pengabdian Masyarakat Sumber Daya Unggul, vol. 3, no. 3, Sept. 2025, pp. 122-37, doi:10.37985/pmsdu.v3i3.1261.