1. Bicknell, Clarence (1913). A Manual for the ancient Etchings in the Italian Sea Alps, Bordighera.
2. Thornes, John (2009). Key Concepts in Geography: Time, Change and Stability in Environmental Systems (2nd ed.). John Wiley & Sons. pp. 119–139. ISBN 978-1-4051-9146-3.
3. Nash, G. (2014.). The figured scenes of Rock-Craftsmanship. Cambridge College Press. pp. 318-349. Documented from the first on Walk 26, 2023. Recovered December 2, 2014.
4. Sharma, Hari Shanker (1987). Tropical geomorphology: a morphogenetic study of Rajasthan. Concept. p. 295. ISBN 81-7022-041-6.
5. Finel, Irving (1995). "A join to the guide of the world: A remarkable revelation". English Gallery Magazine. 23: 26-27.