Cita APA (7th ed.)

Bell J. Jan & Gower R. Roger. (2001). Matters. Upper Intermediate: Students' Book. Longman, 2001.

Cita Chicago (17th ed.)

Bell J. Jan i Gower R. Roger. Matters. Upper Intermediate: Students' Book. Longman, 2001, 2001.

Cita MLA (9th ed.)

Bell J. Jan i Gower R. Roger. Matters. Upper Intermediate: Students' Book. Longman, 2001, 2001.