Suci, Helmanis. “The Impact of Birth Order and Parenting Style on Sibling Rivalry Among Pre-School Children”. Journal of Health Sciences and Epidemiology 1, no. 3 (December 31, 2023): 109–115. Accessed October 5, 2024. https://ejurnal.r2z-scientificpublishing.com/index.php/jhse/article/view/28.