Cita APA (7a ed.)

O'Reilly (Firm), publisher, & Wallen, J. (2018). Securing your Ubuntu server ([First edition].). O'Reilly Media, Inc.

Cita Chicago Style (17a ed.)

O'Reilly (Firm), publisher, y Jack Wallen. Securing Your Ubuntu Server. [First edition]. [Place of publication not identified]: O'Reilly Media, Inc, 2018.

Cita MLA (9a ed.)

O'Reilly (Firm), publisher, y Jack Wallen. Securing Your Ubuntu Server. [First edition]. O'Reilly Media, Inc, 2018.