Cita APA (7a ed.)

Abbs, B., Freebairn, I., & Barker, C. (2001). In Focus 2. Longman.

Cita Chicago Style (17a ed.)

Abbs, Brian, Ingrid Freebairn, y Chris Barker. In Focus 2. Chile: Longman, 2001.

Cita MLA (9a ed.)

Abbs, Brian, et al. In Focus 2. Longman, 2001.