Watkins, D. E., & De Bower, H. F. (1927). Effective speech: Including mental training and the development of personality. New York: The De Bower Publishing.
Trích dẫn kiểu ChicagoWatkins, Dwight Everett, và Herbert Francis De Bower. Effective Speech: Including Mental Training and the Development of Personality. New York: The De Bower Publishing, 1927.
Trích dẫn MLAWatkins, Dwight Everett, và Herbert Francis De Bower. Effective Speech: Including Mental Training and the Development of Personality. New York: The De Bower Publishing, 1927.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.