Aulia Guswandi, Fawina. “School Starting Age and Academic Performance: An Empirical Study in Indonesia”. Jurnal Perencanaan Pembangunan: The Indonesian Journal of Development Planning 5, no. 3 (December 23, 2021): 344 - 362. Accessed January 27, 2022. https://journal.bappenas.go.id/index.php/jpp/article/view/218.