APA aipamena

(2013). Outline of U.S. government. USA: Bureau of International Information Programs.

Chicago Style aipamena

Outline of U.S. Government. USA: Bureau of International Information Programs, 2013.

MLA aipamena

Outline of U.S. Government. USA: Bureau of International Information Programs, 2013.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.