“Strategies at SMP Muhammadiyah 9 Tanggulangin Boarding School in Online and Offline Learning During the Covid-19 Pandemic: Strategi SMP Muhammadiyah 9 Tanggulangin Boarding School dalam Pembelajaran Daring dan Luring dimasa Pandemic Covid-19” (2021) Proceedings of The ICECRS, 10. doi:10.21070/icecrs20211181.