Citazione Stile APA (7a Edizione)

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.