Cita APA (7a ed.)

Helmke, M. A., & Graner, A. C. (2013). The official Ubuntu book (7th ed.). Addison Wesley.

Cita Chicago Style (17a ed.)

Helmke, Matthew Author, y Amber Contributor Graner. The Official Ubuntu Book. 7th ed. [Place of publication not identified]: Addison Wesley, 2013.

Cita MLA (9a ed.)

Helmke, Matthew Author, y Amber Contributor Graner. The Official Ubuntu Book. 7th ed. Addison Wesley, 2013.