http://digfir-published.macmillanusa.com/video_human_comm_accessible/video_human_comm_accessible_ch22.html
Chapter
22. Audience interaction
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http://digfir-published.macmillanusa.com/video_human_comm_accessible/video_human_comm_accessible_ch22_dlap.xmlDLAP questions59d612547894d2db63000002