(2010). U.S.A. History in Brief. USA: Bureau of International Information Programs.
Chicago Style aipamenaU.S.A. History in Brief. USA: Bureau of International Information Programs, 2010.
MLA aipamenaU.S.A. History in Brief. USA: Bureau of International Information Programs, 2010.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.