MICHAEL ALLABY. "velvet worms." A Dictionary of Zoology. 1999. Encyclopedia.com. 6 Dec. 2009 <http://www.encyclopedia.com>.
MICHAEL ALLABY. "velvet worms." A Dictionary of Zoology. 1999. Encyclopedia.com. (December 6, 2009). http://www.encyclopedia.com/doc/1O8-velvetworms.html
MICHAEL ALLABY. "velvet worms." A Dictionary of Zoology. 1999. Retrieved December 06, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-velvetworms.html