Khammas, Emad J., and Mushtaaq T. B. AL-Zuhariy. “The Synergestic Effect of Probiotic and Levamisole on Antibody Titre of Newcastle Disease in Presence of E.Coli As Stress”. Kufa Journal For Veterinary Medical Sciences, vol. 7, no. 1, June 2016, pp. 64-73, doi:10.36326/kjvs/2016/v7i14283.