Nelson, P. E., Titsworth, S., & Pearson, J. C. (2013). iSpeak: Improve your speech credibility (Fifth edition.). McGraw-Hill.
Citace podle Chicago (17th ed.)Nelson, Paul E., Scott Titsworth, a Judy C. Pearson. ISpeak: Improve Your Speech Credibility. Fifth edition. New York, NY: McGraw-Hill, 2013.
Citace podle MLA (9th ed.)Nelson, Paul E., et al. ISpeak: Improve Your Speech Credibility. Fifth edition. McGraw-Hill, 2013.
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