"1927, la primera final radiada" [1927, the final broadcast]. www.eitb.eus (in Basque). 3 April 2021. Archived from the original on 11 January 2023. Retrieved 26 October 2022.
"1927, la primera final radiada" [1927, the final broadcast]. www.eitb.eus (in Basque). 3 April 2021. Archived from the original on 11 January 2023. Retrieved 26 October 2022.
"ECHEVESTE GALFARSORO, José". aunamendi.eusko-ikaskuntza.eus (in Basque). Archived from the original on 11 January 2023. Retrieved 26 October 2022.