REFERENCES
- Beaver, P. C., Jung, R. C. & Cupp, E. W. (1984). Clinical Parasitology, 9th Edn. Philadelphia: Lea & Febiger.
- Chandler, A. C. & Read, C. P. (1961). Introduction to Parasitology, 10th Edn. Tokyo: Toppan.
- Soulsby, E. J. L. (1982). Helminths, Arthropods and Protozoa of Domesticated Animals, 7th Edn. London: Bailliere Tindall.