Blood, D.C. and Studdert, V. P. (1999) Saunders Comprehensive Veterinary Dictionary (2nd Edition), Elsevier Science
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Bridger, J and Russell, P (2007) Virology Study Guide, Royal Veterinary College
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Paterson, S (2006) Skin Diseases of Exotic Pets, Blackwell Publishing
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Roberts, W.A. and Carter, G.A.(1976) Essentials of Veterinary Virology, p. 171, Michigan State University Press, East Lansing, Michigan
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Blood, D.C. and Studdert, V. P. (1999) Saunders Comprehensive Veterinary Dictionary (2nd Edition), Elsevier Science <br>Bridger, J and Russell, P (2007) Virology Study Guide, Royal Veterinary College <br>Paterson, S (2006) Skin Diseases of Exotic Pets, Blackwell Publishing <br>Roberts, W.A. and Carter, G.A.(1976) Essentials of Veterinary Virology, p. 171, Michigan State University Press, East Lansing, Michigan