Rika, Rismawati, and Kholis Nur. 2025. “Faktor Determinan Menurunnya Minat Belajar Matematika Anak Down Syndrome SDN Betet 1 Kediri (Determinants of Decreased Interest in Learning Mathematics Among Children With Down Syndrome at SDN Betet 1 Kediri)”. Happiness: Journal of Psychology and Islamic Science 8 (2):125-39. https://doi.org/10.30762/happiness.v8i2.1158.