In the text well-written concise messages are said to promote clarity speed persuasion Question 9 2 pts Which of the following is suggested in the textbook as a way to ensure the credibility of a source? Assume that if you have heard of the author of the source, then it is credible. Seek out the sources or links within the bibliography to the actual documents. Assume that if the source came from a popular search engine, such as Google, then it is credible