Não informado. Scientific information activities of federal agencies. U.S. National Science Foundation.
Chicago-Zitierstil (17. Ausg.)Não informado. Scientific Information Activities of Federal Agencies. Washington: U.S. National Science Foundation.
MLA-Zitierstil (8. Ausg.)Não informado. Scientific Information Activities of Federal Agencies. U.S. National Science Foundation.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.