APA (7th ed.) Citation

Thornley, G. C. (1962). Key to further practice in english. Longmans.

Chicago Style (17th ed.) Citation

Thornley, G. C. Key to Further Practice in English. London: Longmans, 1962.

MLA (9th ed.) Citation

Thornley, G. C. Key to Further Practice in English. Longmans, 1962.