Cita APA (7a ed.)

Richards, J. C. Interchange. English for international communication. Student´s book 1 (20a ed.).

Cita Chicago Style (17a ed.)

Richards, Jack C. Interchange. English for International Communication. Student´s Book 1. 20a ed.

Cita MLA (8a ed.)

Richards, Jack C. Interchange. English for International Communication. Student´s Book 1. 20a ed.