S. Wahyuningsih, S. Vikasari, and A. Kusmayadi, “Exploring the Alpha-Amylase Inhibitory Potential of Roselle Calyx Extracts (Hibiscus sabdariffa L) in n-Hexane and Ethyl Acetate Fractions”, JKK, vol. 8, no. 1, pp. 85-91, Jun. 2025.