Windarsih, Yulia, Masrianih, and Manap Trianto. “Flavonoid and Alkaloid Content of Red Onion Skin Extract (Allium Cepa L.)”. Jurnal Biologi Tropis 25, no. 1 (March 9, 2025): 886–890. Accessed October 23, 2025. https://jurnalfkip.unram.ac.id/index.php/JBT/article/view/8578.