APA (7th ed.) Citation

Helmke, M., Hudson, A., & Hudson, P. (2017). Ubuntu unleashed (2017 edition.). Sams.

Chicago Style (17th ed.) Citation

Helmke, Matthew, Andrew Hudson, and Paul Hudson. Ubuntu Unleashed. 2017 edition. Indianapolis, Indiana: Sams, 2017.

MLA (9th ed.) Citation

Helmke, Matthew, et al. Ubuntu Unleashed. 2017 edition. Sams, 2017.