APA (7th ed.) Citation

Obee B. Bob & Evans V. (2007). Upstream. Upper-intermediate B2+: Class CD 4. Newbury, Express Publishing, 2007.

Chicago Style (17th ed.) Citation

Obee B. Bob and Evans V. Upstream. Upper-intermediate B2+: Class CD 4. Newbury, Express Publishing, 2007, 2007.

MLA (9th ed.) Citation

Obee B. Bob and Evans V. Upstream. Upper-intermediate B2+: Class CD 4. Newbury, Express Publishing, 2007, 2007.

Warning: These citations may not always be 100% accurate.