Elsheikha, H.M., A.T. Abbas, M.M. Abdel Aziz, and L.M. Elshabiny. 2008. “Therapeutic Efficacy of Chicken Egg Yolk Immunoglobulins Against Mycoplasma Gallisepticum Infection in Chickens ”. International Journal of Poultry Science 7 (6): 548–554. https://doi.org/10.3923/ijps.2008.548.554.