Spring, J. H. (2004). American education (11th ed.). McGraw-Hill.
Chicago Style aipamenaSpring, Joel H. American Education. 11th ed. Boston: McGraw-Hill, 2004.
MLA aipamenaSpring, Joel H. American Education. 11th ed. McGraw-Hill, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.