Παραπομπή APA

Swan, M. (2012). Practical English usage (3rd ed.). Oxford university Press.

Παραπομπή Chicago Style

Swan, Michael. Practical English Usage. 3rd ed. New Delhi: Oxford university Press, 2012.

Παραπομπή MLA

Swan, Michael. Practical English Usage. 3rd ed. Oxford university Press, 2012.