Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.