Citazione Stile APA (7a Edizione)
Alexander, L. (1980). Practice and progress: <an> integrated course for pre-intermediate students. Longman.
Citazione stile Chigago Style (17a edizione)
Alexander, L.G. Practice and Progress: <an> Integrated Course for Pre-intermediate Students. London: Longman, 1980.
Citatione MLA (9a ed.)
Alexander, L.G. Practice and Progress: <an> Integrated Course for Pre-intermediate Students. Longman, 1980.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.