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Schrijver, Peter (December 6, 2019). "Italo-Celtic and the Inflection of *es- 'be'". In Serangeli, Matilde; Olander, Thomas (eds.). Dispersals and Diversification. Brill. pp. 209–235. doi:10.1163/9789004416192_012. ISBN9789004414501. S2CID213806505.
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Cólera, Carlos Jordán (2007) "Celtiberian," e-Keltoi: Journal of Interdisciplinary Celtic Studies: Vol. 6, Article 17. p.759. Available at: https://dc.uwm.edu/ekeltoi/vol6/iss1/17 accessed June 21, 2023
Eska, Joseph F. (March 12, 2018). "Laryngeal Realism and the Prehistory of Celtic". Transactions of the Philological Society. 116 (3). Wiley: 320–331. doi:10.1111/1467-968x.12122. ISSN0079-1636.
Lambert, Pierre-Yves; Stifter, David (2012). "Le plomb gaulois de Rezé". Études Celtiques (in French and English). 38 (1): 139–164. doi:10.3406/ecelt.2012.2351. ISSN0373-1928.