Kandil, F.E., N.H. El-Sayed, H.N. Micheal, M.S. Ishak, and T.J. Mabry. 2010. “Flavonoids from Psidium Guaijava ”. Asian Journal of Chemistry 9 (4):871-72. https://asianpubs.org/index.php/ajchem/article/view/23984.