Petchpoung, K., S. Soiklom, and W. Siri-Anusornsak. “Estimation of Andrographolide and Antioxidant Activities in Andrographis Peniculata Commercial Products by Color Parameters”. Trends in Sciences, vol. 21, no. 3, Jan. 2024, p. 7393, doi:10.48048/tis.2024.7393.