• https://www.nepjol.info/https://www.kar-group.com/https://ijssers.org/https://prodentist.ru/https://journalofmedical.org/https://schwlar.com/https://jurnal.isi-dps.ac.id/https://www.hotelconcordia.ro/https://murninetsv2.planmalaysia.gov.my/https://ojs.uph.edu/
    • Edison, David, Amora Antonio Pangestu, Efanly, dan Rindiany. 2021. “PREDIKSI VOLUME PENJUALAN GAS PT PGN (PERSERO) MENGGUNAKAN REGRESI LINEAR BERGANDA”. Journal of Digital Ecosystem for Natural Sustainability 1 (1):14-18. https://journal.uvers.ac.id/index.php/jodens/article/view/23.