APA

Tims N., . (2005). Face2face: Upper intermediate workbook. Estados Unidos: Cambridge university press.

Chicago

Tims Nicholas, . 2005. Face2face: Upper intermediate workbook. Estados Unidos: Cambridge university press.

Harvard

Tims N., . (2005). Face2face: Upper intermediate workbook. Estados Unidos: Cambridge university press.

MLA

Tims Nicholas, . Face2face: Upper intermediate workbook. Estados Unidos: Cambridge university press. 2005.