O’LEARY, N. C.; MURPHY, P. D.; DRINKWATER, S. J.; BLACKABY, D. H. English Language Fluency and the Ethnic Wage Gap for Men in England and Wales . Economic Issues, [S. l.], v. 6, n. 1, p. 21–32, 2001. Disponível em: http://www.economicissues.org.uk/index.php/EI_OJS/article/view/69. Acesso em: 27 aug. 2026.