Syafi’i , A. A. . . (2020) “Implementation of the Green School Festival to Increase Strengthening of Character Education in Era 4.0: Pelaksanaan Green School Festival Untuk Meningkatkan Penguatan Pendidikan Karakter di Era 4.0 ”, Proceedings of The ICECRS, 8. doi: 10.21070/icecrs2020450.