APA (7th ed.) Citation

Helmke, M., Hudson, A., & Hudson, P. (2019). Ubuntu unleashed (2019 edition.). SAMS.

Chicago Style (17th ed.) Citation

Helmke, Matthew, Andrew Hudson, and Paul Hudson. Ubuntu Unleashed. 2019 edition. Indianapolis, Indiana, USA: SAMS, 2019.

MLA (9th ed.) Citation

Helmke, Matthew, et al. Ubuntu Unleashed. 2019 edition. SAMS, 2019.