Rika, Rismawati, and Kholis Nur. “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, vol. 8, no. 2, Jan. 2025, pp. 125-39, doi:10.30762/happiness.v8i2.1158.