Waterton, Edmund 'Dactyliotheca Watertoniana: a descriptive catalogue of the finger-rings in the collection of Mrs Waterton', p.44, no. 2
Described by Waterton as 'Massive gold ring with a Gorgon's head repoussé, a very remarkable specimen. From the excavations in Sardinia'. There is also a sketch of the front of the ring.
J.V.S. Megaw ‘Two La Tène finger rings in the Victoria and Albert Museum, London: an essay on the human face and Early Celtic Art’, Praehistorische Zeitschrift 43-44 (1965-1966), 96-166
Megaw, Vincent 'Art of the European Iron Age: a study of the elusive image', New York, 1970, p. 111-12, cat. 169