William E Hopke. (1976). Encyclopaedia of careers and vocational guidance- Rev-Ed.- 2 vol. JC Ferguson publishing co.
Chicago Edition CitationWilliam E Hopke. Encyclopaedia of Careers and Vocational Guidance- Rev-Ed.- 2 Vol. Chicago: JC Ferguson publishing co, 1976.
Deismireacht MLAWilliam E Hopke. Encyclopaedia of Careers and Vocational Guidance- Rev-Ed.- 2 Vol. JC Ferguson publishing co, 1976.
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