Cahapay, Michael. “Revisiting the Functions of Curriculum Theory: A Foundational Ground for the Development of Procedural Model to Determine the Null Curriculum”. Indonesian Journal of Curriculum and Educational Technology Studies 8, no. 2 (November 30, 2020): 97-101. Accessed May 4, 2024. https://journal.unnes.ac.id/sju/jktp/article/view/40086.