Prasetyo, Agus, Suyahmo Suyahmo, and Eko Handoyo. “Student’s Establishment of Character and Social Behavior Through Langit Biru Program at SMP Negeri 3 Tuban”. JESS (Journal of Educational Social Studies) 6, no. 2 (December 1, 2017): 125-134. Accessed April 27, 2024. https://journal.unnes.ac.id/sju/jess/article/view/15905.