APA (7th ed.) Zitazioa

Erdmann, P. (1990). Discourse and grammar: Focussing and defocussing in English. M. Niemeyer.

Chicago Style (17th ed.) Zitazioa

Erdmann, Peter. Discourse and Grammar: Focussing and Defocussing in English. Tübingen: M. Niemeyer, 1990.

MLA (9th ed.) Zitazioa

Erdmann, Peter. Discourse and Grammar: Focussing and Defocussing in English. M. Niemeyer, 1990.