(2008). Education 08/09: Annual Editions. Boston: Mc Graw-Hill.
Chicago Style aipamenaEducation 08/09: Annual Editions. Boston: Mc Graw-Hill, 2008.
MLA aipamenaEducation 08/09: Annual Editions. Boston: Mc Graw-Hill, 2008.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.