ULUMUDIN, I.; FAIZAH, N.; NURCAHYO, W. Aplikasi Sistem Presensi Pegawai PT. Berkah Pena Ilmu dengan Metode Location Based Service (LBS) Berbasis Android Menggunakan Firebase. Design Journal, [S. l.], v. 1, n. 1, p. 89–98, 2023. DOI: 10.58477/dj.v1i1.61. Disponível em: http://journal.ypmma.org/index.php/dj/article/view/61. Acesso em: 13 oct. 2025.