Muhammad Akbar, Abdul Qadeer Mehl and M. Javed Arshad , 2003. Death of Antilopes Due to Heavy Infestation of Round Worms. Journal of Biological Sciences, 3: 127-128.
Chandler, A.C. and C.P. Read, 1961. Introduction to Parasitology. 10th Edn., John Wiley and Sons, Inc., New York, pp: 450-455
Coles, G.C., 1986. Anthelmintic Resistance in Sheep. In: Veterinary Clinics of North America, Food Animal Practice, Gibbs, H.C., R.P. Herd and K.D. Murrell (Eds.). W.B. Saunders, Philadelphia, pp: 423-432
Coles, G.C. and R.T. Roush, 1992. Slowing the spread of anthelmintic resistant nematodes of sheep and goats in the United Kingdom. Vet. Res., 130: 505-510.