Purbiyanto, Eko, et al. “Evaluating Parent Satisfaction: The Impact of Educational Service Quality at an Islamic Kindergarten in Colomadu, Karanganyar, Central Java”. AL-ISHLAH: Jurnal Pendidikan, vol. 15, no. 4, Dec. 2023, pp. 6172-81, doi:10.35445/alishlah.v15i4.4663.