Erdmann, P. (1990). Discourse and grammar: Focussing and defocussing in English. M. Niemeyer.
Čikaški stil citiranja (17. izdanje)Erdmann, Peter. Discourse and Grammar: Focussing and Defocussing in English. Tübingen: M. Niemeyer, 1990.
MLA način citiranja (9. izdanje)Erdmann, Peter. Discourse and Grammar: Focussing and Defocussing in English. M. Niemeyer, 1990.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.