Díaz de Rada Igúzquiza, Vidal, and Peio María Ayerdi Etxeberri. “Some Problems Encountered With the Telephone Survey As Used for Electoral Predictions”. Revista Española de Investigaciones Sociológicas, no. 118 (February 29, 2024): 153–204. Accessed June 30, 2024. https://reis.cis.es/index.php/reis/article/view/1380.