Nasution, G. S., dan E. A. . Lubis. “Gambaran Keberadaan Bakteri Bacillus Sp. Pada Ruangan Ber–AC Dan Non AC Systematic Review”. Sains Medisina, vol. 1, no. 2, Desember 2022, hlm. 130-4, https://wpcpublisher.com/jurnal/index.php/sainsmedisina/article/view/148.