1. Animal Insides. http://www.animalinsides.com (accessed October, 2006)
2. Vertebral scale system to measure canine heart size in radiographs;Buchanan;J Am Vet Med Assoc,1995
3. The essential physics of medical imaging;Bushberg,2002
4. Canine cardiology;Ettinger,1970
5. Small animal cardiovascular medicine;Kittleson,1998