Truong, D.M., Bich Thu, N.T. and Nghi, L.T. 2012. Accumulation and variation of rosmarinic acid content in Orthosiphon stamineus Benth. based on phenological stages. Academia Journal of Biology. 32, 3 (May 2012), 65–71. DOI:https://doi.org/10.15625/0866-7160/v32n3.709.