Adzakiyah, T. et al. 2015. Effect of gargling by using siwak extract (Salvadora persica) to the saliva pH of oral cavity. Jurnal Sains Farmasi & Klinis. 2, 1 (Nov. 2015), 74–77. DOI:https://doi.org/10.29208/jsfk.2015.2.1.52.