Cita APA (7a ed.)

Bourne, S. R. (1983). The Unix system. Addison-Wesley.

Cita Chicago Style (17a ed.)

Bourne, S. R. The Unix System. Wokingham [etc.]: Addison-Wesley, 1983.

Cita MLA (9a ed.)

Bourne, S. R. The Unix System. Addison-Wesley, 1983.