Impact of Solvent Selection on Phytochemical Content, Recovery of Tannin and Antioxidant Activity of Quercus Infectoria Galls, Kamarudin, Nur Alisa, Muhamad Norhazilah, Salleh Nik Nur Hakima, and Tan Suat Cheng , Pharmacognosy Journal, September 2021, Volume 13, Issue 5, p.1195-1204, (2021)