Al-Helali, Sh. R., A. A. Al-Sudani, & R. J. Jaber.
" Histological Study of Stomach in (Mallard)  Anas platyrhynchos." <em>Ibn AL- Haitham Journal For Pure and Applied Science</em> [Online], 24.1 (2011): n. pag. Web.  1 Dec. 2019