Παραπομπή APA

William E Hopke. (1976). Encyclopaedia of careers and vocational guidance- Rev-Ed.- 2 vol. JC Ferguson publishing co.

Παραπομπή Chicago Style

William E Hopke. Encyclopaedia of Careers and Vocational Guidance- Rev-Ed.- 2 Vol. Chicago: JC Ferguson publishing co, 1976.

Παραπομπή MLA

William E Hopke. Encyclopaedia of Careers and Vocational Guidance- Rev-Ed.- 2 Vol. JC Ferguson publishing co, 1976.