APA (7th ed.) Citation

Walton, R. (2001). Focus on advanced English C. A. E: Grammar practice (Rev. and updated, 5. impr.). Longman.

Chicago Style (17th ed.) Citation

Walton, Richard. Focus on Advanced English C. A. E: Grammar Practice. Rev. and updated, 5. impr. Harlow, Essex: Longman, 2001.

MLA (9th ed.) Citation

Walton, Richard. Focus on Advanced English C. A. E: Grammar Practice. Rev. and updated, 5. impr. Longman, 2001.