APA (7th ed.) Citation

Obee B. Bob & Evans V. Virginia. (2009). Upstream. Upper-Intermediate B2+: Workbook: Student's Book (6-th ed.). Newbury, Express Publishing, 2009.

Chicago Style (17th ed.) Citation

Obee B. Bob and Evans V. Virginia. Upstream. Upper-Intermediate B2+: Workbook: Student's Book. 6-th ed. Newbury, Express Publishing, 2009, 2009.

MLA (9th ed.) Citation

Obee B. Bob and Evans V. Virginia. Upstream. Upper-Intermediate B2+: Workbook: Student's Book. 6-th ed. Newbury, Express Publishing, 2009, 2009.