W. Winingsih, S. G. Husein, and R. P. N. Ramdhani, “Analysis of Ethyl p-Methoxycinnamate from Kaempferia galanga L. Extract by High Performance Liquid Chromatography”, J. Trop. Pharm. Chem., vol. 5, no. 4, pp. 353–358, Dec. 2021.