Cita APA (7a ed.)
NTIS: 1995-March, 1998. Dialog Information Services : Department of Commerce.
Cita estilo Chicago (17a ed.)
NTIS: 1995-March, 1998. EUA: Dialog Information Services : Department of Commerce.
Cita MLA (9a ed.)
NTIS: 1995-March, 1998. Dialog Information Services : Department of Commerce.
Precaución: Estas citas no son 100% exactas.