Yektiningsih, E., N. Firdausi, and P. Yuliansari. “Correlation Between Sibling Rivalry Toward Knowledge and Development Among Preschool in Kindergarten”. Pediomaternal Nursing Journal, vol. 9, no. 1, Mar. 2023, pp. 1-5, doi:10.20473/pmnj.v9i1.29888.