Kurnianingsih, Andi, and Supriadi Supriadi. “Analysis of Potassium (K) Levels in the Red Betel Leaf (Piper Crocatum Ruiz &Amp; Pav) Using Spectrophotometry Method”. Media Eksakta 18, no. 1 (May 31, 2022): 58–63. Accessed May 2, 2024. https://jurnal.fkip.untad.ac.id/index.php/jme/article/view/1501.