(1985). Speaking with confidence: How to take the worries out of business presentations. New York: BusinessWeek.
Trích dẫn kiểu ChicagoSpeaking With Confidence: How to Take the Worries Out of Business Presentations. New York: BusinessWeek, 1985.
Trích dẫn MLASpeaking With Confidence: How to Take the Worries Out of Business Presentations. New York: BusinessWeek, 1985.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.