APA (7th ed.) Citation

Helmke, M., & Graner, A. (2012). The Official Ubuntu Book (7th edition.). Prentice Hall.

Chicago Style (17th ed.) Citation

Helmke, Matthew, and Amber Graner. The Official Ubuntu Book. 7th edition. Prentice Hall, 2012.

MLA (9th ed.) Citation

Helmke, Matthew, and Amber Graner. The Official Ubuntu Book. 7th edition. Prentice Hall, 2012.

Warning: These citations may not always be 100% accurate.