Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
Development of effective immunity (active or passive) to a disease by artificial means depends on scientific knowledge of the causative agent, pathogenesis of the disease, and natural immune response to the disease.
Kindermann, Candace Anne
"Immunology of Transmissible Gastroenteritis as Applied to the Protection of Newborn Pigs,"
Iowa State University Veterinarian: Vol. 39
, Article 4.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol39/iss3/4