A. W. Al-Bideri and A. Nadeem Jawad, “Comparative Anatomical and Histological Study of Duodenum between Laughing Dove Streptopelia Senegalensis and White breasted Kingfisher, Halcyon Smyrnensis”, QJPS, vol. 22, no. 1, pp. 82 - 92, Apr. 2018.