APA aipamena

(2007). Nation's Report Card: Civics 2006. U.S. Department of Education.

Chicago Style aipamena

Nation's Report Card: Civics 2006. U.S. Department of Education, 2007.

MLA aipamena

Nation's Report Card: Civics 2006. U.S. Department of Education, 2007.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.