Norhidayah Abdullah, Noriham Abdullah, and Mohammad Rusop Mahmood. “Bioactive Phenolic Acid Contents Of Nanoparticle Z. Officinale Rhizome Via High-Performance Liquid Chromatography – Solid Phase Extraction (HPLC-SPE) Methods”. International Journal of Advances in Scientific Research and Engineering (IJASRE), ISSN:2454-8006, DOI: 10.31695/IJASRE 5, no. 12 (December 30, 2019): 59–66. Accessed April 16, 2024. https://ijasre.net/index.php/ijasre/article/view/554.