Харченко, Л. П., and І. О. Ликова. “Lymphoid Structures of the waders’ (Charadrii) Digestive Tract”. The Journal of V.N.Karazin Kharkiv National University. Series «Biology», Vol. 17, no. 1056, Dec. 2013, pp. 123-30, https://periodicals.karazin.ua/biology/article/view/13790.