"Glossary". VPTH 603 Veterinary Parasitology. University of Pennsylvania School of Veterinary Medicine. Archived from the original on 2011-07-18. Retrieved 2019-05-22.
"Glossary". VPTH 603 Veterinary Parasitology. University of Pennsylvania School of Veterinary Medicine. Archived from the original on 2011-07-18. Retrieved 2019-05-22.