4McCroskey JC. Validity of the PRCA as an index oral communication apprehension.Communication Monographs,1978,45:192-203
5Ericson PM,Gardner JW.Two longitudinal studies of communication apprehension and its effects on college students' success. Communication Quarterly,1992,40 (2):127-137
6McCroskey JC.The Effects of communication apprehension on nonverbal behavior. Communication Quarterly,1976,24:39-44
7Holbrook, Hilary Taylor. Communication Apprehension: The Quiet Student in Your Classroom. ERIC Digest. ERIC Clearinghouse on Reading and Communication Skills.1987
