(en) Ramón Zallo, Basques, Today : Culture, History and Society in the Age of Diversity and Knowledge, Alberdania, , 318 p. (ISBN978-84-96643-59-8, lire en ligne)
(en) Max Harris, Carnival and Other Christian Festivals : Folk Theology and Folk Performance, University of Texas Press, , 304 p. (ISBN978-0-292-77930-3, lire en ligne)