Cita APA (7th ed.)

Marsh, D., & Hodsdon, A. (2008). The guardian book of english language. Guardian Creative.

Cita Chicago (17th ed.)

Marsh, David, i Amelia Hodsdon. The Guardian Book of English Language. UK: Guardian Creative, 2008.

Cita MLA (9th ed.)

Marsh, David, i Amelia Hodsdon. The Guardian Book of English Language. Guardian Creative, 2008.