Arrumaisha (2023) “Perbedaan Kemandirian Antara Anak Sulung dengan Anak Tunggal di RA As-Sa’adah Medan: Differences in Independence Between the Eldest Child and the Only Child at RA As-Sa’adah Medan”, Indonesian Journal of Early Childhood: Jurnal Dunia Anak Usia Dini, 5(2), pp. 362–367. doi: 10.35473/ijec.v5i1.2413.