Amorrortu, E., 2003, Basque sociolinguistics: language, society and culture, Reno: Center for Basque Studies, University of Nevada, Basque Textbooks Series. GI-01; GI-03; GI-05; BI-03; AR-03; MA-02; PA-05 Gako-hitzak: Soziolinguistika
Amorrortu, E., 2004, Linguistic attitudes in the Basque Country : the social acceptance of a new variety, Ann Arbor ( Michigan): University Microfilms International. GI-03; GI-05; BI-01 Gako-hitzak: Jarrera; Soziolinguistika