Islam, M. E., M. S. Parvin, M. R. Islam, M. S. Islam, and S. M. R. Hasan. “Antioxidant Activity of the Ethanol Extract of <i>Manilkara zapota</I> Leaf”. Journal of Scientific Research, vol. 4, no. 1, Dec. 2011, p. 193, doi:10.3329/jsr.v4i1.7148.