Isiani, N. et al. 2026. Optimizing Children’s Vocabulary Understanding Through Singing Activities in Early Childhood Education. Edu Happiness: Jurnal Ilmiah Perkembangan Anak Usia Dini. 5, 2 (Jul. 2026), 249–265. DOI:https://doi.org/10.62515/eduhappiness.v5i2.1461.