Joel H., S. (2000). American Education (9th Edn.). McGraw Hill.
Chicago Style (17th ed.) ZitazioaJoel H., Spring. American Education. 9th Edn. McGraw Hill, 2000.
MLA (9th ed.) ZitazioaJoel H., Spring. American Education. 9th Edn. McGraw Hill, 2000.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.