T. Pasaribu, E. Wina, Sumiati, and A. Setiyono, “Saponin Content of Sapindus rarak Pericarp Affected by Particle Size and Type of Solvent, its Biological Activity on Eimeria tenella Oocysts”, Int. J. Poult. Sci., vol. 13, no. 6, pp. 347–352, May 2014, doi: 10.3923/ijps.2014.347.352.