Students'' perceptions of professors credibility is an impressive research. It is clearly written and provides a theortical framework for future research. The issue of students'' perceptions of professors'' teaching methods is addressed with a very balanced account of the applied theory. Using Expectation States Theory, it is clear that perceived professors'' credibility and means in which students obtain classroom learning is complex and involves many dimensions. This book is very helpful for professors, who are willing to increase students'' learning abilities, as well as students who like to obtain and retain classrooms'' provided knowledge.