CONTEMPORARY COMMUNICATION RESEARCH METHODS by Mary John Smith (Belmont, CA: Wadsworth, 1988—price not given, ISBN 0-534-08610-1) MASS COMMUNICATIONS RESEARCH METHODS: A STEP-BY-STEP APPROACH by H.J. Hsia (Hillsdale, NJ: Lawrence Erlbaum Assoc., 1988—$34.50, ISBN 0-89859-914-8) FUNDAMENTALS OF ADVERTISING RESEARCH by Alan Fletcher and Thomas Bowers (Belmont, CA: Wadsworth, 1988—price not given, ISBN 0-534-08454-0) COMMUNICATION THEORY & RESEARCH APPLICATIONS by Michael W. Singletary and Gerald Stone (Ames: Iowa State University Press, 1988—$16.95, paper, ISBN 0-8138-0298-9
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Smith et al. (1989) studied this question.