Obianime, A., and I. Roberts. “The Hormonal Effects of Halofantrine Hydrochloride (Halfan), sulfametopyrazine/pyrimethamine (Metakelfin) and sulfadoxine/Pyrimetamine (Fansidar) in Male Guinea Pigs”. Port Harcourt Medical Journal, vol. 3, no. 3, Aug. 2009, doi:10.4314/phmedj.v3i3.49257.