Cita APA (7a ed.)

Mortimer, C. (1989). Elements of pronunciation: Intensive practice for intermediate and more advanced students. Cambridge University Press.

Cita Chicago Style (17a ed.)

Mortimer, Colin. Elements of Pronunciation: Intensive Practice for Intermediate and More Advanced Students. Cambridge: Cambridge University Press, 1989.

Cita MLA (8a ed.)

Mortimer, Colin. Elements of Pronunciation: Intensive Practice for Intermediate and More Advanced Students. Cambridge University Press, 1989.