APA

Mortimer C., . (1997). Elements of pronunciation: Intensive practice for intermediate and more advanced students. : University Press, Cambridge.

Chicago

Mortimer Colin, . 1997. Elements of pronunciation: Intensive practice for intermediate and more advanced students. : University Press, Cambridge.

Harvard

Mortimer C., . (1997). Elements of pronunciation: Intensive practice for intermediate and more advanced students. : University Press, Cambridge.

MLA

Mortimer Colin, . Elements of pronunciation: Intensive practice for intermediate and more advanced students. : University Press, Cambridge. 1997.