National Science Foundation (U.S.). (1969). Scientific technical and health personnel in the federal government 1969. U.S. Government Printing Office.
Chicago-referens (17:e uppl.)National Science Foundation (U.S.). Scientific Technical and Health Personnel in the Federal Government 1969. Washington, D.C: U.S. Government Printing Office, 1969.
MLA-referens (9:e uppl.)National Science Foundation (U.S.). Scientific Technical and Health Personnel in the Federal Government 1969. U.S. Government Printing Office, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.