Cita APA (7th ed.)

Richards, J. C. (2005). Interchange: Intro workbook A (3a. ed.). Cambridge University.

Cita Chicago (17th ed.)

Richards, Jack C. Interchange: Intro Workbook A. 3a. ed. Nueva York: Cambridge University, 2005.

Cita MLA (9th ed.)

Richards, Jack C. Interchange: Intro Workbook A. 3a. ed. Cambridge University, 2005.