(Kirk's Current Veterinary
Therapy XIII; 2000; «Vaccines and Vaccinations: Issue for the 21st Century», Richard B. Ford and Ronald D. Schultz; (Kirk's Current Veterinary Therapy XI, «Canine and Feline Vaccines,» Phipps, Schultz; R.D. Schultz, «Considerations in Designing Effective and Safe Vaccination Programs for Dogs,» May 2000; Schultz, «Duration of Immunity to Canine Vaccines: What We Know and Don't Know.»)