DeVito, J. A. (2012). The Essential elements of public speaking (Fourth edition, International edition.). Allyn & Bacon.
Lua i Stíl Chicago (17ú heag.)DeVito, Joseph A. The Essential Elements of Public Speaking. Fourth edition, International edition. Boston: Allyn & Bacon, 2012.
Lua MLA (9ú heag.)DeVito, Joseph A. The Essential Elements of Public Speaking. Fourth edition, International edition. Allyn & Bacon, 2012.
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