Safitri, Windi, et al. “Content of Vitamin C, Acceptance, and Serving Size of Various Formulations of Rosella Jam (Hibiscus Sabdariffa L.) As Functional Food Ingredients”. Niramaya Preventive Health Journal, vol. 1, no. 1, Apr. 2026, pp. 8-15, https://literajournal.com/index.php/niramaya/article/view/4.