Evans V. Virginia & Dooley J. Jenny. (2011). Upstream. Pre-Intermediate B1: Workbook: Student's Book (6th ed.). Newbury, Express Publishing, 2011.
Chicago-Zitierstil (17. Ausg.)Evans V. Virginia und Dooley J. Jenny. Upstream. Pre-Intermediate B1: Workbook: Student's Book. 6th ed. Newbury, Express Publishing, 2011, 2011.
MLA-Zitierstil (9. Ausg.)Evans V. Virginia und Dooley J. Jenny. Upstream. Pre-Intermediate B1: Workbook: Student's Book. 6th ed. Newbury, Express Publishing, 2011, 2011.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.