1. Abercromby, A.F., 1911. The effects of the bite of ‘Ancistrodon hypnale’. Spolia Zeylanica vii, 205.
2. An Account of the Interior of Ceylon and of its Inhabitants with Travels in that Island;Davy,1821
3. A Colored Atlas of some Vertebrates from Ceylon, Vol.3: Serpentoid Reptilia;Deraniyagala,1955
4. Hypnale nepa bite: first record;de Silva;Proceedings of the Kandy Society of Medicine,1989
5. Colour Guide to the Snakes of Sri Lanka;de Silva,1990