W. Nurdiyati and B. Haryanto, “The Effect of Training and Education on Strengthening LPPKS Principals on the Dimensions of Planning, Management, Supervision on the Managerial Competence of Islamic Kindergarten Principals in Wonocolo District, Surabaya City.”, acopen, vol. 4, p. 10.21070/acopen.4.2021.2928, Oct. 2021.