United States National Science Foundation. Scientific and technical personnel in the federal government: 1969. For sale by the Superintendent of Documents.
Cita Chicago (17th ed.)United States National Science Foundation. Scientific and Technical Personnel in the Federal Government: 1969. Washington: For sale by the Superintendent of Documents.
Cita MLA (9th ed.)United States National Science Foundation. Scientific and Technical Personnel in the Federal Government: 1969. For sale by the Superintendent of Documents.
Atenció: Aquestes cites poden no estar 100% correctes.