Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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