1. Agbede, R. I. S. (1981).Journal of Animal Production and Research,1, 179–180.
2. Agbede, R. I. S. &Sackey, A. K. (1991).Student Veterinarian Journal,15, 1–5.
3. Bamidele, O. &Amakiri, S. F. (1978).Nigerian Veterinary Journal,7, 45–50.
4. Idowu, L. &Adetunji, A. (1981).Nigerian Veterinary Journal,10, 40–48.
5. Lapage, G. (1968).Veterinary Parasitology. 2nd edn (Revised). Oliver and Boyd, Edinburgh, London. pp 634–674.