Family Characteristics of 6- to 12-year-olds. US Department of Education.
Chicago Style (17th ed.) ZitazioaFamily Characteristics of 6- to 12-year-olds. US Department of Education.
MLA (9th ed.) ZitazioaFamily Characteristics of 6- to 12-year-olds. US Department of Education.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.