Citazione Stile APA (7a Edizione)

ALLEN, W. S. (1974). Living english structure: Key to the exercises. Longman.

Citazione stile Chigago Style (17a edizione)

ALLEN, W. Stannard. Living English Structure: Key to the Exercises. London: Longman, 1974.

Citatione MLA (9a ed.)

ALLEN, W. Stannard. Living English Structure: Key to the Exercises. Longman, 1974.