Citazione Stile APA (7a Edizione)

Alexander, L. G. (1977). New Concept English. Practice and progress. Longman.

Citazione stile Chigago Style (17a edizione)

Alexander, L. G. New Concept English. Practice and Progress. Londres: Longman, 1977.

Citatione MLA (9a ed.)

Alexander, L. G. New Concept English. Practice and Progress. Longman, 1977.