| X American Society for the Prevention of Cruelty to Animals• Foreyt, Veterinary Parasitology Reference Manual Ames, Iowa: 2001 , 40 | McKeever, Tim Nuttall and Richard G |
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| McKeever, Tim Nuttall and Richard G | Sue Patterson, Manual of Skin Diseases of the Dog and Cat, Chicester: Wiley-Blackwell, 2009 , 123-129 |