A. D. Cindani and N. Fediyanto, “An Analysis of Students Errors in Direct-Indirect Sentence in Online Learning during Covid-19 Pandemic of Tenth Grade Vocation High School: Analisis Kesalahan Siswa pada Kalimat Langsung Tidak Langsung dalam Pembelajaran Online pada Pandemi Covid-19 Kelas 10 SMK”, acopen, vol. 6, p. 10.21070/acopen.6.2022.2556, Jun. 2022.