Παραπομπή APA

Butterfield, J. (2008). Oxford A to Z of english usage. Oxford university press.

Παραπομπή Chicago Style

Butterfield, Jeremy. Oxford A to Z of English Usage. Noida: Oxford university press, 2008.

Παραπομπή MLA

Butterfield, Jeremy. Oxford A to Z of English Usage. Oxford university press, 2008.