Nguyen, M., H. Nguyen, N. Nguyen, and M. Nguyen. “Total Polyphenol Contents of An Giang Medicinal Plants”. VNUHCM Journal of Science and Technology Development, Vol. 17, no. 2, June 2014, pp. 5-9, doi:https://doi.org/10.32508/stdj.v17i2.1309.