1. Canine infectious tracheobronchitis (kennel cough): A status report;Appel;Compend. Contin. Educ. Pract. Vet.,1981
2. Does canine coronavirus augment the effects of subsequent parvovirus infection?;Appel;Vet. Med.,1988
3. Lyme disease in dogs and cats;Appel;Compend. Contin. Educ. Pract. Vet.,1990
4. Can a commercial vaccine protect pups against a recent field isolate of parvovirus?;Appel;Vet. Med.,1987
5. Canine distemper virus;Appel,1972