APA

Proctor S., . (1997). New interchange: English for international communication. Student ́s book 1. Cambridge: Cambridge University Press.

Chicago

Proctor Susan, . 1997. New interchange: English for international communication. Student ́s book 1. Cambridge: Cambridge University Press.

Harvard

Proctor S., . (1997). New interchange: English for international communication. Student ́s book 1. Cambridge: Cambridge University Press.

MLA

Proctor Susan, . New interchange: English for international communication. Student ́s book 1. Cambridge: Cambridge University Press. 1997.