Ferris, Howard (23 May 2005). "Ancylostoma duodenale". Nemaplex: Nematode-Plant Expert Information System. University of California, Davis. Archived from the original on 1 March 2009. Retrieved 22 January 2009.
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Ferris, Howard (23 May 2005). "Ancylostoma duodenale". Nemaplex: Nematode-Plant Expert Information System. University of California, Davis. Archived from the original on 1 March 2009. Retrieved 22 January 2009.