Cita APA (7a ed.)

Barnes, M. G., & Smith, P. D. (1988). Files and databases: An intriduction (NULL.).

Cita Chicago Style (17a ed.)

Barnes, Michael G., y Peter D. Smith. Files and Databases: An Intriduction. NULL. Massachussetts, 1988.

Cita MLA (8a ed.)

Barnes, Michael G., y Peter D. Smith. Files and Databases: An Intriduction. NULL. 1988.