APA

DeVito J. A., . (1987). The elements of public speaking. New York: Harper & Row.

Chicago

DeVito Joseph A, . 1987. The elements of public speaking. New York: Harper & Row.

Harvard

DeVito J. A., . (1987). The elements of public speaking. New York: Harper & Row.

MLA

DeVito Joseph A, . The elements of public speaking. New York: Harper & Row. 1987.