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Hualde, José Ignacio (2021). "On the Comparative Method, Internal Reconstruction, and Other Analytical Tools for the Reconstruction of the Evolution of the Basque Language: An Assessment". Anuario del Seminario de Filología Vasca "Julio de Urquijo". 54 (1–2): 19–52. doi:10.1387/asju.23021. hdl:10810/59003.
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Hualde, José Ignacio (2020 [2022]). «On the comparative method, internal reconstruction, and other analytical tools for the reconstruction of the evolution of the Basque language: An assessment», ASJU, 54 (1-2), 19-52. (https://doi.org/10.1387/asju.23021).
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Hualde, José Ignacio; Lujanbio, Oihana; Zubiri, Juan Joxe (2010). "Goizueta Basque"(PDF). Journal of the International Phonetic Association. 40: 113–127. doi:10.1017/S0025100309990260. Archived(PDF) from the original on 28 May 2018.
Hualde, José Ignacio (2020 [2022]). «On the comparative method, internal reconstruction, and other analytical tools for the reconstruction of the evolution of the Basque language: An assessment», ASJU, 54 (1-2), 19-52. (https://doi.org/10.1387/asju.23021).
Hualde, José Ignacio (2021). "On the Comparative Method, Internal Reconstruction, and Other Analytical Tools for the Reconstruction of the Evolution of the Basque Language: An Assessment". Anuario del Seminario de Filología Vasca "Julio de Urquijo". 54 (1–2): 19–52. doi:10.1387/asju.23021. hdl:10810/59003.
The first telegraph message in Basque was sent by Teodoro de Arana y Beláustegui, at the time a deputy to the Cortes from Gipuzkoa, to Ondarroa; it read: Aitorreu hizcuntz ederrean nere lagun eta erritarrai bistz barrengo eroipenac (transl.heartfelt regards to my friends and compatriots in the wonderful language of Aitor), Diario de Reus 26.06.04
Hualde, José Ignacio; Lujanbio, Oihana; Zubiri, Juan Joxe (2010). "Goizueta Basque"(PDF). Journal of the International Phonetic Association. 40: 113–127. doi:10.1017/S0025100309990260. Archived(PDF) from the original on 28 May 2018.
Basque's two rhotics contrast only between vowels, and the trill is then written as -rr- and the tap as -r-. When a suffix is added to a word ending in -r, a trill is generally used, as in ederrago 'more beautiful', from eder 'beautiful' and -ago. There is a small number of words that are exceptions to the rule, with de Rijk listing the following ten common ones: zer, ezer, nor, inor, hor, paper, plater, plazer, ur, and zur.