Sheffield, A. D. (1922). Joining in public discussion: A study of effective speechmaking for members of labor unions, conferences, forums and other discussion groups. New York: George H. Doran Company.
Lua i Stíl Chicago (17ú heag.)Sheffield, Alfred Dwight. Joining in Public Discussion: A Study of Effective Speechmaking for Members of Labor Unions, Conferences, Forums and Other Discussion Groups. New York: George H. Doran Company, 1922.
Lua MLA (8ú heag.)Sheffield, Alfred Dwight. Joining in Public Discussion: A Study of Effective Speechmaking for Members of Labor Unions, Conferences, Forums and Other Discussion Groups. New York: George H. Doran Company, 1922.
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