SURIPTO, .-. Pelatihan Surat Menyurat Elektronik Era 4.0 Siswa-Siswi di SMK Negeri 3 Kotabumi . Jurnal Sumbangsih, [S. l.], v. 1, n. 1, p. 44–50, 2020. DOI: 10.23960/jsh.v1i1.8. Disponível em: https://sumbangsih.lppm.unila.ac.id/index.php/jsh/article/view/8. Acesso em: 24 aug. 2025.