United States. National Science Foundation. (1056). Organization of the Federal Government for scientific activities. United States Government Printing Office.
Παραπομπή σε μορφή Chicago (17η εκδ.)United States. National Science Foundation. Organization of the Federal Government for Scientific Activities. Washington: United States Government Printing Office, 1056.
Παραπομπή σε μορφή MLA (9th εκδ.)United States. National Science Foundation. Organization of the Federal Government for Scientific Activities. United States Government Printing Office, 1056.
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