Wasserman, P., & McLean, J. W. (1979). Consultants and consulting organizations directory: A reference guide to concerns and individuals engaged in consultation for business and industry (4th ed.). Detroit: Gale Research.
Παραπομπή Chicago StyleWasserman, Paul,, and Janice W. McLean. Consultants and Consulting Organizations Directory: A Reference Guide to Concerns and Individuals Engaged in Consultation for Business and Industry. 4th ed. Detroit: Gale Research, 1979.
Παραπομπή MLAWasserman, Paul,, and Janice W. McLean. Consultants and Consulting Organizations Directory: A Reference Guide to Concerns and Individuals Engaged in Consultation for Business and Industry. 4th ed. Detroit: Gale Research, 1979.
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