Bibliography : Viper
| Claudius Aelianus; A. F. Scholfield, trans. | On the Nature of Animals |
| Thomas Brown; James Eason, ed. | Pseudodoxia Epidemica: Or, Enquiries into very many Received Tenents and commonly presumed Truths |
| Anne Clark | Beasts and Bawdy |
| Michael J. Curley | Physiologus |
| Ann Payne | Medieval Beasts |
