Tolong jelaskan mengenai Bahan bacaan dari Ula gadhung dalam bahasa jawa

David, P. & G. Vogel. 1997. The Snakes of Sumatra. An annotated checklist and key with natural history notes. Edition Chimaira. Frankfurt.

Stuebing, R.B. & R.F. Inger. 1999. A Field Guide to The Snakes of Borneo. Natural History Publications (Borneo). Kota Kinabalu.

Tweedie, M.W.F. 1983. The Snakes of Malaya. The Singapore National Printers. Singapore