Andika Sari, Diah, et al. “Relationship Between Preparation and Attitude in 3-4 Year Old Children Regarding Newborn Sibling ”. Al-Athfal: Jurnal Pendidikan Anak, vol. 8, no. 1, June 2022, pp. 1-12, https://doi.org/10.14421/al-athfal.2022.81-01.