Cita APA (7a ed.)

Canonical Ltd. (2012). Ubuntu 12.04 LTS: Linux for Human Beings. Canonical.

Cita Chicago Style (17a ed.)

Canonical Ltd. Ubuntu 12.04 LTS: Linux for Human Beings. [S.l.]: Canonical, 2012.

Cita MLA (9a ed.)

Canonical Ltd. Ubuntu 12.04 LTS: Linux for Human Beings. Canonical, 2012.