V. O. Sirama, J. Kokwaro, B. Owuor, and Y. Amir, “In-vitro anthelmintic activity of Vernonia amygdalina Del. (asteraceae) roots using adult Haemonchus contortus worms”, Int J of Pharmc Res, vol. 5, no. 1, pp. 1–7, Feb. 2015, doi: 10.7439/ijpr.v5i1.1533.