“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”, icecrs, vol. 10, Oct. 2021, doi: 10.21070/icecrs20211181.