Hualde 2021, p. 32–35. 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.
Gorrochategui 2022, p. 116. Gorrochategui, Joaquín (2022). "The Relationship between Aquitanian and Basque: Achievements and Challenges of the Comparative Method in a Context of Poor Documentation". In Thiago Costa Chacon (ed.). Language Change and Linguistic Diversity: Studies in Honour of Lyle Campbell. Edinburgh University Press. pp. 105–129. doi:10.1515/9781474488143-010.
Hualde 2021, p. 27–32. 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.
Hualde 2021, p. 29. 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.
Hualde 2021, p. 27. 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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Michelina 1990, p. 11 Michelina, Luis (1990). Fonética histórica vasca. Obras completas de Luis Michelena I (in Spanish) (secunda, electronica de la ed. impresa ed.). Donostia San Sebastian: Diputacion Foral de Gipuzkoa.
Hualde 2021, p. 32–35. 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.
Hualde 2021, p. 27–32. 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.
Hualde 2021, p. 29. 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.
Hualde 2021, p. 27. 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.