Duszynski, Donald W; Upton, Steve J. and Couch, Lee (2004). "The Coccidia of the World". Department of Biology, University of New Mexico, and Division of Biology, Kansas State University. Archived from the original(Online database) on 2010-12-30. Retrieved 2014-02-21.{{cite web}}: CS1 maint: multiple names: authors list (link)
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Duszynski, Donald W; Upton, Steve J. and Couch, Lee (2004). "The Coccidia of the World". Department of Biology, University of New Mexico, and Division of Biology, Kansas State University. Archived from the original(Online database) on 2010-12-30. Retrieved 2014-02-21.{{cite web}}: CS1 maint: multiple names: authors list (link)