4. REFRENSI

  1. Borg, J. (2014). Persuasion. Essex: Pearson Education Limited.
  2. Sirait, Charles Bonar (2007). The Power of Public Speaking. Jakarta : Gramedia Pustaka Utama
  3. Carneige, Dale. (2007). The Art of Public Speaking. Cosimo Classic
  4. Fine, Debra. (2008). The Fine Art of The Big Talk. Jakarta: Gramedia Pustaka Utama.
  5. Sriewijono, Alexander.(2008). Talk inc Points. Jakarta: Gramedia Pustaka Utama.