Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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