Não informado. (1968). Government Reports Index. U.S. Department of Commerce, National Technical Information Service.
Chicago-Zitierstil (17. Ausg.)Não informado. Government Reports Index. Washington: U.S. Department of Commerce, National Technical Information Service, 1968.
MLA-Zitierstil (8. Ausg.)Não informado. Government Reports Index. U.S. Department of Commerce, National Technical Information Service, 1968.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.