Aiello, S.E. and Mays, A.  1998.  The Merck Veterinary Manuel Eighth Edition.  Merck and Co., Inc.,  Whitehouse Station, NJ.      pp. 551-555.

Tilley, L.P. and Smith, F.W.K.  2000.  The 5-Minute Veterinary Consult Canine and Feline Second Edition.  Lippincott 
Williams and Wilkins, Baltimore, Maryland.  pp. 696-697.  

Ishida, T., Shibanai, A., Tanaka, S., Uchida, K. and M. Mochizuki. 2003. Use of recombinant feline interferon and glucocorticoid     in the treatment of feline infectious peritonitis. Journal of Feline Medicine and Surgery. 6(2) pp 107-109.