Salsabila, Elfina, and Erfan Priyambodo. “Analysis of Calcium Levels in Yoghurt Drinks Using a UV-Visible Spectrophotometry Method”. Indonesian Journal of Chemical Science 12, no. 3 (November 13, 2023): 269-277. Accessed September 27, 2024. http://journal.unnes.ac.id/sju/ijcs/article/view/74918.