Citazione Stile APA (7a Edizione)

Warner, A. R. (1993). English auxiliaries: Structure and history. Cambridge University Press.

Citazione stile Chigago Style (17a edizione)

Warner, Anthony R. English Auxiliaries: Structure and History. Cambridge: Cambridge University Press, 1993.

Citatione MLA (9a ed.)

Warner, Anthony R. English Auxiliaries: Structure and History. Cambridge University Press, 1993.