Halbrich, J. (1965). Spoken english: An intermediate course : for travellers to Great Britain and the U.S.A.
Citazione stile Chigago Style (17a edizione)Halbrich, J.O. Spoken English: An Intermediate Course : For Travellers to Great Britain and the U.S.A. Buenos Aires, 1965.
Citatione MLA (9a ed.)Halbrich, J.O. Spoken English: An Intermediate Course : For Travellers to Great Britain and the U.S.A. 1965.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.