APA (7th ed.) Citation

Ward, B. (2015). How Linux works: What every superuser should know (Second edition.). No Starch Press.

Chicago Style (17th ed.) Citation

Ward, Brian. How Linux Works: What Every Superuser Should Know. Second edition. San Francisco: No Starch Press, 2015.

MLA (9th ed.) Citation

Ward, Brian. How Linux Works: What Every Superuser Should Know. Second edition. No Starch Press, 2015.