Koffuor, G. A., J. Ofori-Amoah, S. Kyei, S. Antwi, and S. Abokyi. “Anti-Tussive, Muco-Suppressant and Expectorant Properties, and the Safety Profile of a Hydro-Ethanolic Extract of Scoparia Dulcis”. International Journal of Basic & Clinical Pharmacology, vol. 3, no. 3, Jan. 2017, pp. 447-53, https://www.ijbcp.com/index.php/ijbcp/article/view/1003.