Hypnale nepa LAURENTI 1768
| Zweiter Beitrag zur Herpetologie der indo-australischen Region Franz Werner (1896) Verh. Zool. Bot. Ges. Wien 46: 6-24 | |
| A new pit viper of the genus Ancistrodon (1908) Journal of The Bombay Natural History Society 18: 792-793 | |
| On some parasitic Protozoa from Ceylon (1910) Spolia Zeylanica 7: 65-87 | |
| The snakes of Ceylon Edward H Taylor (1950) Univ. Kansas Sci. Bull. 33(14): 519-603 | |
| Descriptions of new taxa of crotalid snakes from China and Ceylon (Sri Lanka) (1977) Proceedings of The Biological Society of Washington 90: 1002-1015 |