Herman, Ayuthia Ramadhani. “Chi-Square Analysis of the Percentage of the Bottom 40% Expenditure Group Aged 0–17 Years With Birth Certificate Ownership in Indonesia”. Reflection: Education and Pedagogical Insights 2, no. 2 (March 31, 2025): 62–67. Accessed January 8, 2026. http://firstcierapublisher.com/index.php/reflection/article/view/134.