The Princeton Language Institute, Princeton Language Institute, Philip Lief Group, & Laskowski, L. (2001). 10 days to more confident public speaking. Warner Books.
Dyfyniad Arddull ChicagoThe Princeton Language Institute, Princeton Language Institute, Philip Lief Group, and Lenny Laskowski. 10 Days to More Confident Public Speaking. New York: Warner Books, 2001.
Dyfyniad MLAThe Princeton Language Institute, et al. 10 Days to More Confident Public Speaking. Warner Books, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.