Dyfyniad APA

O'Brien, L. (2013). Speak well. New York, NY: McGraw-Hill Higher Education.

Dyfyniad Arddull Chicago

O'Brien, Liz. Speak Well. New York, NY: McGraw-Hill Higher Education, 2013.

Dyfyniad MLA

O'Brien, Liz. Speak Well. New York, NY: McGraw-Hill Higher Education, 2013.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.