APA (7th ed.) Citation
Walton, R., & O'Connell, S. (1994). Focus on Advanced English. Grammar Practice. Thomas Nelson and Sons.
Chicago Style (17th ed.) Citation
Walton, Richard, and Sue O'Connell. Focus on Advanced English. Grammar Practice. London: Thomas Nelson and Sons, 1994.
MLA (9th ed.) Citation
Walton, Richard, and Sue O'Connell. Focus on Advanced English. Grammar Practice. Thomas Nelson and Sons, 1994.
Warning: These citations may not always be 100% accurate.