Safitri B, Nurhikmah S, Indriyani PD. Kontribusi kegiatan ekstrakurikuler paduan suara terhadap peningkatan prestasi akademik di tingkat sekolah menengah: The contribution of choir extracurricular activities to improving academic achievement at the secondary school level. KPSBSL [Internet]. 2025 Sep. 15 [cited 2026 Oct. 16];2(2):126-39. Available from: https://ojs.ympn2.or.id/index.php/KPSBSL/article/view/108