A. K. Sarker, K. Ahamed, J. U. Chowdhury, and J. Begum, “Characterization of an Expectorant Herbal Basak Tea Prepared with <i>Adhatoda vasica</i> Leaves”, Bangladesh J. Sci. Ind. Res., vol. 44, no. 2, pp. 211–214, Nov. 2009.