Wongthai, N., W. Tanticharakunsiri, S. Mangmool, and D. Ochaikul. “Characteristics and Antioxidant Activity of Royal Lotus Pollen, Butterfly Pea Flower, and Oolong Tea Kombucha Beverages”. Asia-Pacific Journal of Science and Technology, vol. 26, no. 04, Sept. 2021, pp. APST-26, doi:10.14456/apst.2021.47.