APA (7th ed.) Citation

Obee, B., & Evans, V. (2003). Upstream: Upper intermediate : student's book. Express Publishing.

Chicago Style (17th ed.) Citation

Obee, Bob, and Virginia Evans. Upstream: Upper Intermediate : Student's Book. Newbury: Express Publishing, 2003.

MLA (9th ed.) Citation

Obee, Bob, and Virginia Evans. Upstream: Upper Intermediate : Student's Book. Express Publishing, 2003.