Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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