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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)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.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)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.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.