Sasongko, Ashadi. “Ammonia Determination In Bottled Water Using Spectrophotometer : Comparison Between Nessler And Berthelot Methods”. JST (Jurnal Sains dan Teknologi) 7, no. 1 (July 2, 2018): 126–134. Accessed July 18, 2024. https://ejournal.undiksha.ac.id/index.php/JST/article/view/13009.