Lee, W., R. Mahmud, R. Noordin, S. Piaru, S. Perumal, and S. Ismail. “Alkaloids Content, Cytotoxicity and Anti-Toxoplasma Gondii Activity of Psidium Guajava L. And Tinospora Crispa”. Bangladesh Journal of Pharmacology, Vol. 7, no. 4, Nov. 2012, pp. 272-6, doi:10.3329/bjp.v7i4.12499.