Swine influenza: a zoonosisАрхивирано на веб-сајту Wayback Machine (28. април 2009). Veterinary Sciences Tomorrow. ISSN 1569-0830. "Influenza B and C viruses are almost exclusively isolated from man, although influenza C virus has also been isolated from pigs and influenza B has recently been isolated from seals.", Приступљено 15. 9. 2003.
Swine influenza: a zoonosisАрхивирано на веб-сајту Wayback Machine (28. април 2009). Veterinary Sciences Tomorrow. ISSN 1569-0830. "Influenza B and C viruses are almost exclusively isolated from man, although influenza C virus has also been isolated from pigs and influenza B has recently been isolated from seals.", Приступљено 15. 9. 2003.