Cita APA (7th ed.)
Hopke, W. E. (1967). The encyclopedia of careers and vocational guidance.
Cita Chicago (17th ed.)
Hopke, William E. The Encyclopedia of Careers and Vocational Guidance. 1967.
Cita MLA (9th ed.)
Hopke, William E. The Encyclopedia of Careers and Vocational Guidance. 1967.
Atenció: Aquestes cites poden no estar 100% correctes.