Ibrahim, H., B. B. Mdau, A. Ahmed, and M. Ilyas. 2010. “ANTHRAQUINONES OF CISSUS POPULNEA GUILL & PERR (AMPLIDACEAE)”. African Journal of Traditional, Complementary and Alternative Medicines 8 (2):140-43. https://journals.athmsi.org/index.php/ajtcam/article/view/1221.