(2017). Delta Academic Objectives - Listening and Note Taking Skills B2-C1 Coursebook with Audio CD. Stuttgart Klett Sprachen GmbH.
Chicago-referens (17:e uppl.)Delta Academic Objectives - Listening and Note Taking Skills B2-C1 Coursebook with Audio CD. German: Stuttgart Klett Sprachen GmbH, 2017.
MLA-referens (9:e uppl.)Delta Academic Objectives - Listening and Note Taking Skills B2-C1 Coursebook with Audio CD. Stuttgart Klett Sprachen GmbH, 2017.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.