Barus, Aguslina Wati Kristina, Wisnu Hidayat, and Henny Arwina Bangun. “The Habit of Indiscriminate Spitting in Betel Chewing”. Jurnal Prima Medika Sains 5, no. 2 (December 10, 2023): 108–112. Accessed April 3, 2026. http://139.162.50.187/index.php/jpms/article/view/4315.