Nordhoff, Sebastian; Hammarström, Harald; Forkel, Robert; Haspelmath, Martin biên tập (2013). “Basque”. Glottolog. Leipzig: Max Planck Institute for Evolutionary Anthropology.
Nordhoff, Sebastian; Hammarström, Harald; Forkel, Robert; Haspelmath, Martin biên tập (2013). “Basque”. Glottolog. Leipzig: Max Planck Institute for Evolutionary Anthropology.