Cita APA (7a ed.)

Evans, V., & Dooley, J. (2002). Upstream: Intermediate. Express Publishing.

Cita Chicago Style (17a ed.)

Evans, Virginia, y Jenny Dooley. Upstream: Intermediate. Newbury: Express Publishing, 2002.

Cita MLA (8a ed.)

Evans, Virginia, y Jenny Dooley. Upstream: Intermediate. Express Publishing, 2002.