Quantification of Andrographolide in Andrographis paniculata (Burm.f.) Nees, Myricetin in Syzygium cumini (L.) Skeels, and Brazilin in Caesalpinia sappan L. by HPLC Method, Masaenah, Eem, Elya Berna, Setiawan Heri, Fadhilah Zahra, and Arianti Varda , Pharmacognosy Journal, November 2021, Volume 13, Issue 6, p.1437-1444, (2021)