1. Coles, E. H. (1967). InVeterinary Clinical Pathology, p. 337. London: W. B. Saunders, Co.
2. Jackson, R. F. (1969). ‘Diagnosis of heartworm disease by examination of the blood’.Journal of American Veterinary Medical Association,154, 374–376.
3. Lindsey, J. R. (1965). ‘Identification of canine microfilariae’.Ibid.,146, 1106–1114.
4. Newton, W. L. &Wright, W. H. (1957). ‘A re-evaluation of the canine filariasis problems in the United States’.Veterinary Medicine,52, 75–78.
5. Schalm, O. W. (1965). InVeterinary Haematology, 2nd Ed., p. 55. London: Bailliere, Tindall & Cassell, Ltd.