Ashadi, Firman, et al. “Development of a STEAM Based Science Busy Book to Enhance Early Childhood Cognitive Development”. Jurnal Kependidikan : Jurnal Hasil Penelitian Dan Kajian Kepustakaan Di Bidang Pendidikan, Pengajaran, Dan Pembelajaran, vol. 11, no. 4, Dec. 2025, pp. 1549-61, doi:10.33394/jk.v11i4.17413.