Cita APA (7a ed.)
Hopke, W. E. (1967). The encyclopedia of careers and vocational guidance.
Cita estilo Chicago (17a ed.)
Hopke, William E. The Encyclopedia of Careers and Vocational Guidance. 1967.
Cita MLA (9a ed.)
Hopke, William E. The Encyclopedia of Careers and Vocational Guidance. 1967.
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