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Cita Chicago (17th ed.)National Research Council i Richard Bertram Curtis. The Invisible University: Postdoctoral Education in the United States. Report of a Study Conducted Under the Auspices of the National Research Council. Washington: National Academy of Sciences, 1969.
Cita MLA (9th ed.)National Research Council i Richard Bertram Curtis. The Invisible University: Postdoctoral Education in the United States. Report of a Study Conducted Under the Auspices of the National Research Council. National Academy of Sciences, 1969.