* {{cite book | last=Divers | first=Stephen J. | last2=Mader | first2=Douglas R. | title=Reptile Medicine and Surgery - E-Book | publisher=Elsevier Health Sciences | date=2005-12-13 | isbn=978-1-4160-6477-0}}
<ref name="x890">{{cite book | last=Divers | first=Stephen J. | last2=Mader | first2=Douglas R. | title=Reptile Medicine and Surgery - E-Book | publisher=Elsevier Health Sciences | date=2005-12-13 | isbn=978-1-4160-6477-0 | page=}}</ref>