APA (7th ed.) Citation

Gethin, H. (1990). Grammar in context: Proficiency level English. Harper Collins Publishers.

Chicago Style (17th ed.) Citation

Gethin, Hugh. Grammar in Context: Proficiency Level English. London: Harper Collins Publishers, 1990.

MLA (9th ed.) Citation

Gethin, Hugh. Grammar in Context: Proficiency Level English. Harper Collins Publishers, 1990.

Warning: These citations may not always be 100% accurate.