Perancangan Sistem Informasi Presensi Non Pegawai Berbasis Mobile Menggunakan QR Code di PT Perkebunan Nusantara IV Medan. j.ilm.Sains.Teknologi [Internet]. 2024 Aug. 5 [cited 2025 Jun. 30];8(2):209-1. Available from: https://www.lppm-unbaja.ac.id/ejournal/index.php/saintek/article/view/3134