APA (7th ed.) Citation

HORNBY, A. S. (1977). Guide to patterns and usage in english -- Ed. 2. Oxford University Press.

Chicago Style (17th ed.) Citation

HORNBY, A. S. Guide to Patterns and Usage in English -- Ed. 2. Oxford: Oxford University Press, 1977.

MLA (9th ed.) Citation

HORNBY, A. S. Guide to Patterns and Usage in English -- Ed. 2. Oxford University Press, 1977.