Martínez de Zúñiga, Uxue (12 May 2020). "Tajonar, la cantera de España" [Tajonar, Spain's youth system]. Diario AS (in Spanish). Retrieved 27 April 2022.
"Contrato de Javier Eraso" [Javier Eraso's contract] (in Spanish). Athletic Bilbao. 1 July 2015. Archived from the original on 28 August 2017. Retrieved 1 July 2015.
"Contrato de Javier Eraso" [Javier Eraso's contract] (in Spanish). Athletic Bilbao. 1 July 2015. Archived from the original on 28 August 2017. Retrieved 1 July 2015.