United States. National Science Foundation. (1056). Organization of the Federal Government for scientific activities. United States Government Printing Office.
Cita Chicago (17th ed.)United States. National Science Foundation. Organization of the Federal Government for Scientific Activities. Washington: United States Government Printing Office, 1056.
Cita MLA (9th ed.)United States. National Science Foundation. Organization of the Federal Government for Scientific Activities. United States Government Printing Office, 1056.
Atenció: Aquestes cites poden no estar 100% correctes.