Citazione Stile APA (7a Edizione)
Petley, M. Introducing America: A text for english as a foreing language with reading selections, dialogs and grammar review. Washington Publications.
Citazione stile Chigago Style (17a edizione)
Petley, Mary. Introducing America: A Text for English as a Foreing Language with Reading Selections, Dialogs and Grammar Review. Washington: Washington Publications.
Citatione MLA (9a ed.)
Petley, Mary. Introducing America: A Text for English as a Foreing Language with Reading Selections, Dialogs and Grammar Review. Washington Publications.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.