Haekase, Yongky, Fakhruddin Fakhruddin, and Arief Yulianto. “Entrepreneurial Instinct of Principal to Manage Production Activities in Christian Pandhega Jaya High School”. Educational Management 9, no. 2 (December 23, 2020): 241-247. Accessed September 27, 2024. https://journal.unnes.ac.id/sju/eduman/article/view/39750.