Cita APA (7a ed.)
(1989). Online and CD-Rom Databases School Libraries. Libraries Unlimited.
Cita Chicago Style (17a ed.)
Online and CD-Rom Databases School Libraries. Englewood: Libraries Unlimited, 1989.
Cita MLA (9a ed.)
Online and CD-Rom Databases School Libraries. Libraries Unlimited, 1989.
Precaución: Estas citas no son 100% exactas.