Marsh, D., & Hodsdon, A. (2008). The guardian book of english language. Guardian Creative.
Chicago Style (17th ed.) ZitazioaMarsh, David, eta Amelia Hodsdon. The Guardian Book of English Language. UK: Guardian Creative, 2008.
MLA (9th ed.) ZitazioaMarsh, David, eta Amelia Hodsdon. The Guardian Book of English Language. Guardian Creative, 2008.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.