APA

Redston C., . (2005). Face2face: Elementary workbook. Estados Unidos: Cambridge university press.

Chicago

Redston Chris, . 2005. Face2face: Elementary workbook. Estados Unidos: Cambridge university press.

Harvard

Redston C., . (2005). Face2face: Elementary workbook. Estados Unidos: Cambridge university press.

MLA

Redston Chris, . Face2face: Elementary workbook. Estados Unidos: Cambridge university press. 2005.