Legendre, Alfred M.; Bartges, Joseph W. (2009). «Effect of Polyprenyl Immunostimulant on the survival times of three cats with the dry form of feline infectious peritonitis». Journal of Feline Medicine & Surgery11 (8): 624–6. doi:10.1016/j.jfms.2008.12.002. PMID19482534.
Legendre, Alfred M.; Bartges, Joseph W. (2009). «Effect of Polyprenyl Immunostimulant on the survival times of three cats with the dry form of feline infectious peritonitis». Journal of Feline Medicine & Surgery11 (8): 624–6. doi:10.1016/j.jfms.2008.12.002. PMID19482534.