Purbasari, Euis, Oktadio Erikardo, and Rifa Audia Jasmine. 2022. “Relationship of Smoking Habits to The Potential of Hydrogen (pH) of Saliva in Active Smokers”. Jurnal EduHealth 13 (02):881-86. https://ejournal.seaninstitute.or.id/index.php/healt/article/view/933.