Siregar, Parulian Ruli, et al. “Problems and Solutions for Literacy Development of 5th Grade Elementary School Students Amidst Covid-19 Pandemic Era in Mandailing Natal Regency”. Jurnal Basicedu, vol. 5, no. 6, Nov. 2021, pp. 5601-13, doi:10.31004/basicedu.v5i6.1694.