APA
DeVito J. A., . (2012). The essential elements of public speaking. Boston: Allyn & Bacon.
Chicago
DeVito Joseph A, . 2012. The essential elements of public speaking. Boston: Allyn & Bacon.
Harvard
DeVito J. A., . (2012). The essential elements of public speaking. Boston: Allyn & Bacon.
MLA
DeVito Joseph A, . The essential elements of public speaking. Boston: Allyn & Bacon. 2012.