Citazione Stile APA (7a Edizione)

Abbs, B., & Freebairn, I. B. (2001). In focus 3: Student's book + workbook.

Citazione stile Chigago Style (17a edizione)

Abbs, Brian, e Ingrid Barker Freebairn. In Focus 3: Student's Book + Workbook. [Harlow?], 2001.

Citatione MLA (9a ed.)

Abbs, Brian, e Ingrid Barker Freebairn. In Focus 3: Student's Book + Workbook. 2001.