Ibarra, O. 1994. Ultzamako euskararen azterketa.
@misc{Ibarra-1994, author = {Ibarra, O.}, school = {University of the Basque Country, Vitoria-Gasteiz}, title = {Ultzamako euskararen azterketa}, year = {1994}, iso_code = {eus}, olac_field = {general_linguistics; phonology; phonetics; typology}, wals_code = {bqi; bqn} }