Leonanda, A., and J. Silalahi. “ANALISIS KESULITAN BELAJAR SISWA XI DPIB SMK N 1 TANJUNG RAYA SAAT PEMBELAJARAN DARING PADA MASA PANDEMI COVID-19”. Jurnal Applied Science in Civil Engineering, Vol. 2, no. 2, June 2021, pp. 206-14, doi:10.24036/asce.v2i2.158566.