Stack, L. (2013). Supercompetent speaking: Lessons learned after 20 years as a professional speaker. The Productivity Pro.
Chicago-Zitierstil (17. Ausg.)Stack, Laura. Supercompetent Speaking: Lessons Learned After 20 Years as a Professional Speaker. Highlands Ranch: The Productivity Pro, 2013.
MLA-Zitierstil (9. Ausg.)Stack, Laura. Supercompetent Speaking: Lessons Learned After 20 Years as a Professional Speaker. The Productivity Pro, 2013.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.