Beast
Bibliography : Viper
| 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 |
| A.F. Haalboom | het serpent scalker dan eenich dier op aertrijck - De behandelwijze van slangen en serpenten in de Middelnederlandse encyclopedieën "Van den proprieteyten der dinghen" en "Der naturen bloeme" |
| Ann Payne | Medieval Beasts |
| Hana Šedinová | From the Dictionary of Medieval Latin in Czech Lands: Ypnapus, Vipera and Rais |
