por Darwin, Charles, 1809-1882 [autor] | Burkhardt, Frederick, 1912-2007 [editor] | Rubio Diez, Ana María [traductor] | University of Cambridge.
por Murphy, Raymond [autor] | Smalzer, William R [colaborador].
por Richards, Jack C [autor] | Hull, Jonathan [autor] | Proctor, Susan, 1945- [autor] | Richards, Jack C. Interchange : English for international communication | Richards, Jack C. New interchange.