<i>Cerastest cerastes</i> (<i>Cerastes cornutus</i>), as pictured in Otto's Encyclopedida (Ottův slovník naučný, 1908).
Unknown author<span style="display: none;">Unknown author</span>. The author of the picture in the encyclopedia is not given, although it is possible that it is <a href="https://en.wikisource.org/wiki/cs:Autor:Franti%C5%A1ek_Bayer_(1854%E2%80%931936)" class="extiw" title="s:cs:Autor:František Bayer (1854–1936)">František Bayer</a>, author of the text of the entry <i>Zingiber</i>.
"Zmije." Ottův Slovník Naučný. Vol. 27. Praha: J. Otto, 1908. 650–652. Print