APA
Mortimer C., . (1985). Elements of pronunciation: Intensive practice for intermediate and more advanced students. Cambridge: University Press.
Chicago
Mortimer Colin, . 1985. Elements of pronunciation: Intensive practice for intermediate and more advanced students. Cambridge: University Press.
Harvard
Mortimer C., . (1985). Elements of pronunciation: Intensive practice for intermediate and more advanced students. Cambridge: University Press.
MLA
Mortimer Colin, . Elements of pronunciation: Intensive practice for intermediate and more advanced students. Cambridge: University Press. 1985.