Kaplan, O. J. (1948). Encyclopedia of vocational guidance. Philosophical Library.
Lua i Stíl Chicago (17ú heag.)Kaplan, Oscar J. Encyclopedia of Vocational Guidance. New York: Philosophical Library, 1948.
Lua MLA (9ú heag.)Kaplan, Oscar J. Encyclopedia of Vocational Guidance. Philosophical Library, 1948.
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