APA Style
Verderber, R, F. et al (2012).
The Challenge of Effective Speaking 15 Ed. (15).
United States of America:
Wadsworth.
MLA Style
Verderber, Rudolph, F.. et al.
"The Challenge of Effective Speaking 15 Ed.".
15
United States of America:
Wadsworth,
2012.
Ilmu Komunikasi.