Razali, Zainab, Muhammad Faris Abd Wahab, Roejhan Md Kawi, Megawati Omar, & Chia Chay Tay. " Sunflower Helianthus annuus for Phytoremediation of Zinc in Hydroponic System." Scientific Research Journal [Online], 17.2 (2020): 99-118. Web. 6 Dec. 2023