APA (7th ed.) Citation

Bell, J., & Gower, R. (1991). Intermediate matters: Student's book. Longman.

Chicago Style (17th ed.) Citation

Bell, Jan, and Roger Gower. Intermediate Matters: Student's Book. Essex, England: Longman, 1991.

MLA (9th ed.) Citation

Bell, Jan, and Roger Gower. Intermediate Matters: Student's Book. Longman, 1991.