^D. H. Lawrence (16 April 2013). Etruscan Places. Read Books Limited. s. 97–. ISBN 978-1-4474-8782-1. "The great hilltop or headland on which Etruscan "Volterra," Velathri, Vlathri, once stood spreads out jaggedly, with deepcleft valleys in between, more or less in view, spreading two or three miles away. It is something like a hand, the bluff steep ..."
^D. H. Lawrence; Simonetta de Filippis (11 July 2002). Sketches of Etruscan Places and Other Italian Essays. Cambridge University Press. s. 315–. ISBN 978-0-521-00701-6. "Volterra Velathri in Etruscan, Volaterrae in Latin; it flourished between the 4th and the ist centuries BC. In 298 BC the town yielded without resistance to the Romans and maintained a major role amongst the centres of n. Etruria up to the ..."
^Jean MacIntosh Turfa (13 November 2014). The Etruscan World. Routledge. s. 134–. ISBN 978-1-134-05523-4. "The lives of many Etruscan cities extend for a millennium or more from the end of the Bronze Age, providing abundant ... Vetulonia, Volterra and probably also Caere, were already occupied in the Final Bronze Age (Protovillanovan period, ..."
^Haynes, Sybille (2005) (på English). Etruscan Civilization: A Cultural History. Los Angeles: Getty Trust Publications. s. 30. ISBN 978-0-89236-600-2.
^Alan Norman Bold (1976). Cambridge Book of English Verse, 1939-1975. CUP Archive. s. 220–. ISBN 978-0-521-09840-3. "Volterra is a modern town in Tuscany and was once one of twelve cities of Etruria. 1] crack in the stone: like mankind, Volterra stands at the edge of crumbling cliffs. Much of Volterra has dropped down into 'the slow abyss' of erosion."
^Damgaard Andersen, Helle (1997) (på English). Urbanization in the Mediterranean in the 9th to 6th Centuries BC. Copenhagen: Museum Tusculanum Press. s. 344. ISBN 9788772894126.