American Association of Bovine Practitioners:  http://aabp.org/

American Association of Equine Practitioners:  http://aaep.org/

American Animal Hospital Association:  http://www.aahanet.org/

Bracken Fern Information: http://www.cbif.gc.ca/pls/pp/ppack.info?p_psn=73&p_type=all&p_sci=comm&p_x=px

Google Search Engine:  http://www.google.ca/

The Horse:  http://www.thehorse.com/

Western College of Veterinary Medicine:  http://www.usask.ca/wcvm/

Wikpedia Papillomavirus Article: http://en.wikipedia.org/wiki/Papillomavirus