Broughton, G. (1972). Success with English: The Penguin course (Repr.). Penguin Education.
Citazione stile Chigago Style (17a edizione)Broughton, Geoffrey. Success with English: The Penguin Course. Repr. Harmondsworth [etc.]: Penguin Education, 1972.
Citatione MLA (9a ed.)Broughton, Geoffrey. Success with English: The Penguin Course. Repr. Penguin Education, 1972.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.