Cita APA (7a ed.)

Helmke, M., Joseph, E. K., Rey, J. A., & Hill, B. M. (2017). The official Ubuntu book (Ninth edition.). Prentice Hall.

Cita Chicago Style (17a ed.)

Helmke, Matthew, Elizabeth K. Joseph, José Antonio Rey, y Benjamin Mako Hill. The Official Ubuntu Book. Ninth edition. Boston: Prentice Hall, 2017.

Cita MLA (8a ed.)

Helmke, Matthew, et al. The Official Ubuntu Book. Ninth edition. Prentice Hall, 2017.