Astuti B, Sugiyatno S, Aminah S. The development of early childhood sex education materials for early childhood education (ECE) teachers. j. pendidik. pemberdaya. masy. [Internet]. 2017 Nov. 29 [cited 2025 May 13];4(2):113-20. Available from: https://journal.uny.ac.id/index.php/jppm/article/view/14869