1. Murdoch, James. 1883.A Plea for Spoken Language., 22New York: Van Antwerp Bragg & Co.
2. Sheridan, Thomas. 1803.Lectures on Elocution,, American edition 13
3. Murdoch, James.A Plea for Spoken Language35
4. Sheridan, Thomas. 1788.A Rhetorical Grammar of the English Language.171Philadelphia
5. Walker, John. 1810.Elements of Elocution166Boston